About
*Dr. Ah San is currently only accepting patients 6 years and older.
R. Keone Ah San is a certified Physician Assistant. He has more than a decade of clinical experience, with the majority of those years working for one of the busiest Endocrine/Renal clinics in Southern California. As a result, he has extensive experience in seeing Internal Medicine, Endocrine, and Renal patients.
Growing up in Hawaii, he developed an early interest in sports and nutrition. This helped influence his decision to earn a Bachelor’s Degree in Exercise and Movement Science from the University of Oregon, Eugene. Remembering how his childhood pediatrician could always make him feel better, he went on to earn a Masters in Medical Science from the Department of Family Medicine/Physician Assistant Program at Emory School of Medicine in Decatur, Georgia. Today, he enjoys being able to play his part in helping to improve the quality of his patients’ lives and, just like his childhood pediatrician did for him, make them feel better.
Languages
English
Provider Specialty
Physician Assistant, Primary Care
Areas of Care
Education
Allied Health Education
Emory University School of Medicine - PA
2000
Locations & Affiliations
Locations
MemorialCare Medical Group - Rancho Santa Margarita
29472 Avenida de las Banderas
Rancho Santa Margarita, CA
Office: 877-696-3622
Affiliations
Insurance
Please consult your health care provider or health plan for the most accurate information about your health plan’s coverage of a particular health care service offered at a MemorialCare facility. Learn more about our Accepted Health Plans.
Patient Reviews
4.9 out of 5
(500 Ratings)
(500 Ratings)
Mar 10, 2026
Juan E.
Mar 9, 2026
Roberto V.
Mar 3, 2026
Leticia V.
Mar 3, 2026
Raul R.
Dr. Ah San is the best. Every time I have an appointment to see him, he gives me the impression that he really cares about my health and my wellbeing.
Mar 2, 2026
Paramjit K.
DR. Ryan performed a very good annual review along with other suggestions for health improvement as well as follow up appointments and suggestion for a PT doctor. Good visit.
Feb 27, 2026
Chi C.
He’s fantastic and will tell you what’s going on
Feb 25, 2026
Ian S.
Feb 25, 2026
Dennis S.
Feb 23, 2026
Denise L.
Mr Ahh San has been my main health care provider for many years. He is personable, medically knowledgeable and I trust him implicitly. I have highly recommended him to family and friends .
Feb 23, 2026
Rhandee A.
Feb 21, 2026
Avery A.
Feb 20, 2026
Erin M.
I think he is a compassionate and caring man. Very thorough with all my questions. He never makes you feel rushed like he’s running off to his next patient
Feb 19, 2026
Dinesh S.
A wonderful and thorough doctor who provides clear guidance and has great insight, experience, and trust
Feb 19, 2026
Shirley J.
He was very attentive
Feb 19, 2026
Tim D.
Feb 18, 2026
Maria E.
He always takes the time to ask about my symptoms and answer any questions I might have.
Feb 18, 2026
Douglas M.
Great communicator and very thorough!
Feb 17, 2026
Robert N.
Dr. Ryan is the best.
Feb 16, 2026
Michael W.
Ryan is always personable and professional.
Feb 16, 2026
Daniel E.
Feb 14, 2026
Marcy P.
Very caring nature, explaining all the way and helpful with the medicine.
Feb 12, 2026
Joe C.
Going to the doctor, not my favorite thing but talking to this young man is always a blessing. Everything gets taken care of.
Feb 10, 2026
Jason F.
Feb 10, 2026
Daniel L.
Very knowledgeable. Better then any DR I’ve seen.
Feb 10, 2026
Valerie H.
Always personable, and never rushes through the appointment
Feb 9, 2026
Sheri G.
He listens to you and helps you 100%
Feb 6, 2026
Rickey P.
Feb 4, 2026
Fernando V.
Great customer support and very thrurough about any questions asked. Reason I still come to this location.
Feb 3, 2026
Jeffrey J.
Feb 3, 2026
Nina B.
Listened to my problem and spent time to ask me the history of my problem and explaining the steps to take for solving it.
Feb 3, 2026
John D.
Ryan is very thorough and easy to talk to.
Feb 3, 2026
Robert A.
He was detailed and decisive
Jan 29, 2026
Amat T.
Mr. Ah San is attentive a always looking out for me as his patient.
Jan 29, 2026
Saritha R.
Jan 28, 2026
Richard B.
Jan 28, 2026
Jeff G.
Jan 20, 2026
Lawrence G.
Keone has been my primary care doctor for many years. He is always easy to discuss health issues with and is very knowledgeable.
Jan 19, 2026
Kristina K.
He's a very kind man, explains things thoroughly and listens to feedback.
Jan 17, 2026
Anonymous
Office visitThorough and genuinely kind. Professionally addresses health concerns with compassion. Easy to talk to. Listens attentively to my concerns and answers questions respectfully.
Jan 16, 2026
Michael H.
Thorough and genuinely kind. Professionally addresses health concerns with compassion. Easy to talk to. Listens attentively to my concerns and answers questions respectfully.
Jan 16, 2026
Sonia K.
Jan 16, 2026
William T.
Always happy with Dr. Ah San. Hope he never leaves RSM.
Jan 15, 2026
Ryan R.
Always friendly, attentive, on point, helps guide in the right direction. 1st Dr I felt like actually listens and tries to help
Jan 14, 2026
Adrien K.
Great PC!Thank-you!!
Jan 14, 2026
Leonor G.
Jan 13, 2026
Abhishek M.
Extremely approachable. Listens well!
Jan 9, 2026
Steven M.
Ryan always takes the time to explain all the issues options with vaccines urgency of follow up on skin, etc. this extra context really helps and is appreciated. Thank you.
Jan 9, 2026
Michael M.
Jan 8, 2026
Mercedes S.
Excellent
Jan 5, 2026
Michael H.
Mr. Ah San is very considerate, takes the time to understand my issues and provides helpful advice and treatment.
Jan 2, 2026
Kim E.
He listened to the concerns I had about my symptoms and gave me an accurate diagnosis.
Jan 1, 2026
Marguerite F.
For excellent care and treatment on every single visit for past 10+ years.
Jan 1, 2026
Keith T.
Ryan K Ah San is a tremendous asset to MemorialCare Medical Group.He listens closely, he's engaged and focused, and he is informative and clear on directions. He is a knowledgeable medical professional and an impressive communicator.MemorialCare is fortunate to have him on board, and I feel lucky to have been connected to a consultation with him.
Dec 29, 2025
Bernadette L.
Dec 26, 2025
Anna J.
Excellent at diagnosing and making appropriate recommendations for at home care
Dec 24, 2025
Claudia B.
He is very kind and professional .
Dec 24, 2025
Jamie C.
Keone is the most patient and thorough medical care provider I’ve experienced. Grateful for the time and consideration he shows his patients.
Dec 23, 2025
Ann D.
He always take very good care of myself.
Dec 12, 2025
Jose C.
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Dec 11, 2025
Andrew A.
Dr Ah San, is very straight forward and doesn’t waste time. Love that. Saw him only twice and had great experiences
Dec 9, 2025
Clifford C.
Dec 9, 2025
Guillermo Z.
Dec 8, 2025
Chris L.
Very considerate and thorough!
Dec 3, 2025
Dinora C.
Really like the Doctor very knowledgeable, caring, asked questions and made me feel very comfortable.
Dec 3, 2025
Russell B.
Always top notch.
Dec 3, 2025
Brett C.
Dec 1, 2025
Mojdada M.
He is care about patients
Nov 28, 2025
Gloria Q.
Nov 25, 2025
David A.
Great listener! Very thorough.
Nov 24, 2025
Rosa H.
He listens and cares for client’s well being.
Nov 21, 2025
Wanda B.
Nov 21, 2025
Steve S.
Super knowledgeable and friendly
Nov 20, 2025
Brian L.
Nov 19, 2025
George F.
Knowledgeable, courteous.
Nov 17, 2025
Monica E.
He explain very well everything and takes the ruine to check why are you suck
Nov 17, 2025
Brian B.
Dr Ah San was friendly and very helpful
Nov 14, 2025
Ivan O.
Direct and explainable results of my lab
Nov 7, 2025
Anonymous
Listens and understandsListened to my concerns and gave options.
Nov 6, 2025
Clyde H.
Dr. Ah San was straight forward, thorough and understanding. Listened to my concerns and gave me options.
Nov 5, 2025
Roberto V.
On time and know my ailment very well
Nov 4, 2025
Eric K.
He was very thorough.
Nov 4, 2025
Brett C.
I like that my doctor listens to me and my issues and has a structured plan to deal with them. He is a great doctor!
Nov 3, 2025
Ward T.
Great common sence.
Oct 30, 2025
Loni G.
So thorough and thoughtful. Did not feel rushed at all and yet I was in and out because they honor your time in the office. Very happy with my first experience here and already recommended Dr. K to my husband.
Oct 30, 2025
Randy
Dr. Keone Ah San listens to what I have to say and give very good advise and/or feedback. Takes the time with each visit and follows up as needed. I know I am in safe hands with my healthcare with Dr. Ah San. Highly recommend Dr. Ah San to anyone looking for a great PCP.
Oct 28, 2025
Thomas B.
Very focused on all aspect of my visit
Oct 23, 2025
Erin M.
He listens to what you have to say and addresses everything. Doesn’t rush you in and out. Easy to talk to.Caring person.
Oct 22, 2025
Steven V.
Oct 21, 2025
Michael W.
Keone is always highly professional in all aspects of the visit. He listens to concerns, is very detailed in his examination and communicates accurately and concisely.
Oct 21, 2025
Robert S.
Great service.
Oct 20, 2025
Jose G.
This pa is very professional and show concern for his patient. Thank you
Oct 20, 2025
Herminia C.
He is always concern about my health and keep me up to date the new thing to keep me healthy
Oct 17, 2025
Anonymous
He is amazing and I trust himDr keone ah san is amazing. He is incredibly knowledgeable and takes the time and has great patience to explain things to me. I trust him. He is an asset and gem.
Oct 16, 2025
Tyler H.
Oct 16, 2025
Anonymous
Excellent careThis was a very good visit. Mr Ah San took the time to listen to my concern, explained the course of treatment and addressed any additional concerns. He did not rush through the visit. Overall a great experience.
Oct 16, 2025
Olivia D.
Oct 16, 2025
Stacy S.
Dr keone ah san is amazing. He is incredibly knowledgeableand takes the time and has great patience to explain things to me. I trust him. He is an asset and gem.
Oct 14, 2025
Anonymous
Didn't feel rushed
Oct 14, 2025
Paul S.
Genuine concern
Oct 10, 2025
Thomas G.
Completely satisfied! Professional and explains everything to me so I can understand my options.The best provider I have ever had!
Oct 10, 2025
Anonymous
Smart, conscientious provider.It was my get established visit and he was very thorough in reviewing the information in the system. He didn’t hesitate to answer questions , nor to research a question he didn’t have the answer to regarding MRNA.
Oct 9, 2025
Irene T.
He’s very smart, knowledgeable and articulate. I appreciate his researching a question asked regarding Mrna and coming back with the answer.
Oct 8, 2025
Jennifer W.
He’s very nice , & professional.
Oct 6, 2025
Cindy R.
He spent time with me and answered my questions. I didn’t feel rush!
Oct 3, 2025
Robert L.
Excellent and through
Oct 2, 2025
Jodi N.
Friendly, clear and knowledgeable.
Oct 2, 2025
Carol K.
I appreciate his thoroughness, empathy and listening skills.
Sep 30, 2025
Mark D.
Quick and easy
Sep 29, 2025
Michael H.
Mr. Ah San is a rock star among care givers. Not sure what else I can say. Smart. Great communicator. Really listens and cares. Highly HIGHLY recommend!
Sep 29, 2025
Pamela S.
He’s very knowledgeable and very thorough.
Sep 29, 2025
Kathy G.
PA Ryan, is kind,very knowledgeable and listens to what I say. I never feel rushed with him.
Sep 24, 2025
Sebastian F.
Mr. Ah San is very professional and thorough. Does a great job listening.
Sep 19, 2025
Leticia S.
Like always, the experience is very positiveThe
Sep 18, 2025
Birgit H.
Great doctor who listens and addresses your concerns.
Sep 16, 2025
Valerie H.
Very personable
Sep 9, 2025
Roger H.
Personable and knowledgeable. Always look forward to visits.
Sep 8, 2025
Jeremy E.
Excellent
Sep 4, 2025
Fred C.
As always he listens and responds thoughtfully and professionally to my questions as if I was a friend who can handle the good and challenging truth he gives.
Sep 3, 2025
Veronica D.
I felt heard and was given options. He is easy to talk to.
Sep 3, 2025
Nathan B.
Dr. Awesome is the best
Sep 2, 2025
Mikayla S.
On time. Great listener and sense of humor. So knowledgeable!
Aug 28, 2025
Ed P.
Aug 28, 2025
Ann D.
Aug 27, 2025
Alberto L.
I had a great experience and he did a thorough explanation of what was going on
Aug 26, 2025
Mayra N.
PA Ah Son is always polite and very professional. Trust his opinion and his advice.
Aug 20, 2025
Anonymous
Cares about patientsHe’s knowledgeable and cares about my well being. He’s quick at responding messages and I appreciate his kind personality
Aug 20, 2025
Russell B.
Always takes the time to explain things, always feel you are in the know of his thoughts and recommendations.
Aug 20, 2025
Teresa C.
He was very throughout
Aug 19, 2025
Rosa H.
He’s knowledgeable and cares about my well being. He’s quick at responding messages and I appreciate his kind personality
Aug 18, 2025
Randy M.
Dr. Keone is thorough, friendly and genuinely cares. Gives sound advice also.
Aug 11, 2025
Michael L.
He is knowledgeable and friendly, seemed to care about my concerns
Aug 11, 2025
Barton E.
PA Ah San is always friendly, professional and knowledgeable. Been going to him for years.
Aug 8, 2025
Alexander K.
He was so helpful and thorough and efficient!
Aug 8, 2025
Raymond W.
Everything. Visit was prompt. Listened to my health issue well. Performed brief exam which was incredibly useful. Prescribed both short-term and long-term improvement paths. Fantastic job!!!
Aug 6, 2025
Barbara K.
Ryan was excellent. He listened and addressed all of my questions and I have many appointments to go to now thank you for helping me stay healthy! I don’t believe he is the best doctor I have ever been to so far
Aug 6, 2025
James M.
He’s a great physician very friendly very knowledgeable. I like him a lot would recommend him highly to anybody.
Aug 6, 2025
Kristina K.
He was thorough and clear with what he thought I needed to do discuss different options with me and was very accommodating
Aug 4, 2025
Audy M.
Excellent medical provider.
Jul 31, 2025
Darrel B.
Very thorough.
Jul 29, 2025
David B.
Appointment same day, quick office visit and treatment
Jul 25, 2025
Sallie G.
He is real, honest, and clearly cares.
Jul 23, 2025
Stephen D.
He's a very intelligent doctor and a pleasure to deal with. By far the best doctor I've had since coming to Memorial.
Jul 22, 2025
Dennis O.
Doctor explained in detail many tips to stay healthy. Answered all questions.
Jul 22, 2025
Kelly P.
He’s cool ??
Jul 19, 2025
Anonymous
Dr is listening to me and clearly he is talking abDr is listening to me and clearly he is talking about my health condition and giving me the best advice and medication
Jul 18, 2025
Ahmad N.
Dr is listening to me and clearly he is talking about my health condition and giving me the best advice and medication
Jul 18, 2025
Ivan O.
Great assessment of my illness and provided excellent insight and analysis on my condition and recommended a sound treatment plan
Jul 16, 2025
Vivian L.
I love that he always takes the time to explain everything, And listen the patient.
Jul 16, 2025
Katherine P.
He listened to my problems & he listened i felt comfortable with him.
Jul 11, 2025
Romina M.
I always love coming to do my annual exam. The provider is always so sweet and accommodating, highly recommend.
Jul 1, 2025
Everett O.
PA Ryan is great and motivating me to make healthy choices. He was prepared for our video appointment with a thorough understanding of all my blood results and recommendations.
Jun 30, 2025
Judy D.
Great doctor, always on time, explains things clearly, and provides effective treatment with good follow up.
Jun 25, 2025
Kristin S.
Very professional and took the time to listen and give me an understanding of what I came in for and best ways to move forward
Jun 21, 2025
Evelyn S.
He was so knowledgeable about my issue and helped me get my Rx even easier than before So grateful to him
Jun 20, 2025
Marguerite F.
Mr. ah San is by far the best PA (Doctor) i have ever seen. I recently referred a friend to him and she absolutely was so impressed and thankful.
Jun 19, 2025
Jorg K.
Good feedback.
Jun 18, 2025
Carol I.
Explanation of decision making process clear. Good collaboration with patient on plan
Jun 16, 2025
Eric P.
He took his time, went over everything on my blood work had good suggestions. Ask if I had any questions
Jun 12, 2025
Maria G.
He make me feel confident in my health, he explained wherever I consurn about He is patienr and kind He is a good Doctor he really cares about others
Jun 10, 2025
Tim D.
He is open and honest with me.
Jun 9, 2025
Saritha R.
Good experience.
Jun 5, 2025
Michael W.
Ryan K Ah San is always highly professional, detail oriented and an outstanding listener. He listens when explaining symptoms, matches what was stated with background and info on chart, and diagnoses based on facts. He is very credible and always makes you feel at ease as a patient.
Jun 4, 2025
Brett C.
I’m extremely happy with my doctor. He is attentive and always shows that he genuinely cares about my health. I would recommend him to anyone looking for a top notch health care provider.
Jun 4, 2025
Gina C.
Jun 4, 2025
Sharmaine F.
Jun 3, 2025
Dean M.
Jun 3, 2025
Kathleen P.
Jun 3, 2025
Jeremy E.
Amazing care from the entire staff and Physician.
Jun 3, 2025
Samantha W.
Everything
Jun 3, 2025
Fred C.
He listens to me and my concerns and brings up concerns to be discussed. He seems very knowledgeable
Jun 2, 2025
Joseph J.
He’s my primary doctor.
Jun 2, 2025
Bruce F.
Very professional and right on time for video appointment.
May 30, 2025
Norma G.
He took the time to listen to my concerns, gave me a plan of care.
May 28, 2025
Denise C.
Mr. Ah San is very nice and takes an interest in my care. He always provides me with good information regarding my health concerns.
May 28, 2025
Nancy C.
Great listener and very caring
May 28, 2025
Armand W.
Great at communication. Takes time to understand, deliberate and explain. Don’t rush to conclusions
May 27, 2025
Desmond F.
He seems to really want to help
May 23, 2025
Diana C.
He is very thorough
May 22, 2025
Stephen E.
He is very thorough and professional.
May 22, 2025
Robert V.
Great advice and counsel. Courteous and professional.
May 22, 2025
Daniel F.
Best care provider I have ever had, and one of the warmest people that I know. He really cares about me, my health, and my spirit. Whenever I come in to the office, I know that I am with someone who is focused on helping me be the healthiest that I can possibly be.
May 22, 2025
Michael W.
Ryan is always personable and takes time to listen to me.
May 19, 2025
Reginaldo E.
I will alway be indebted to Dr. Ah-San for his proactive care. He played a primary role in saving my life. He worked in concert with my Cleveland Clinic transplant team to remove the barriers that the Health Care system can inadvertently construct. If you need a can-do doctor who genuinely cares about his patients, Dr. Ah-San is your person.
May 19, 2025
William T.
May 19, 2025
Robert N.
May 19, 2025
Norma N.
Attentiveness and professionalism.
May 17, 2025
Larry B.
Excellent! Very personable, great bedside manner.
May 9, 2025
Cheyne T.
Suggesting a sensible approach to my current symptoms.
May 9, 2025
James U.
Candid and thorough explanations and healthy recommendations
May 7, 2025
Kyle P.
Very knowledgeable and helpful, he was able to answer all my questions.
May 6, 2025
Claudia B.
Very knowledge, very professional and always caring for the patients.
May 5, 2025
Russell B.
May 5, 2025
Patricia B.
May 5, 2025
Linda Z.
He’s always so thorough, makes sure I understand, and answers any questions I have.
May 5, 2025
Valerie H.
May 2, 2025
Raul R.
Dr. Ah San is real thorough and is focused on my well being.
May 1, 2025
Clyde H.
Dr. Ah San was very positive on his feedback on my condition and had helpful suggestions on what I should do to stay healthy.
May 1, 2025
Michelle M.
Very professional and all of my questions answered!
May 1, 2025
Manuel O.
Great
May 1, 2025
Richard Z.
Very caring and considerate
May 1, 2025
Leticia P.
He is the best
Apr 30, 2025
Carol K.
He listens and had good ideas for me to move forward.
Apr 30, 2025
Sandra W.
He’s always punctual so I don’t have to wait. Very thorough with my medical care.
Apr 30, 2025
Cristobal V.
Greatest attention
Apr 30, 2025
Edward L.
On time and responsive to questions.
Apr 29, 2025
Roberto V.
On time and thorough in check up
Apr 25, 2025
Curtis E.
Very friendly
Apr 23, 2025
Wendy T.
Brian Nissan is always professional and very informative. And his nurse was very kind and informative also
Apr 9, 2025
Trever H.
Asks questions, great listener and explains things so both my son and me understand.
Apr 9, 2025
Paul S.
The excellent bedside manner.
Apr 9, 2025
Suzanne K.
Mr Ah San listens. He is informative. He understood my concerns and addressed them all.
Apr 9, 2025
Steven M.
Dr Ryan took the time to review all my results and answered all my questions.
Apr 8, 2025
Yassman B.
Amazing attitude and knowledge
Apr 8, 2025
George D.
Always caring.
Apr 7, 2025
Andrew M.
Good bedside manner. Professional. Good listener.
Apr 7, 2025
Alberto L.
Friendly and everyone made my Dr. visit feel as if was greeted by family
Apr 7, 2025
Julia E.
He was through. He understood my concerns and put me at ease. His personality was funny and warm. He was easy to talk with.
Apr 4, 2025
Kenneth F.
Apr 4, 2025
Michael A.
Fast friendly professional and informative.
Apr 3, 2025
Hillary H.
Apr 2, 2025
Henry H.
Apr 1, 2025
Aulani A.
Ryan was great! He was quick yet thorough. Very friendly and did great speaking with my daughter. Thanks Ryan!
Mar 31, 2025
Kurt H.
Great bedside manner. He listens, explains and provides easy to understand explanations & reasoning. Very nice doctor.
Mar 31, 2025
Christina P.
Amazing. and through
Mar 31, 2025
Deborah W.
Easy to talk to and explains everything clearly.
Mar 31, 2025
Wanda B.
Listened to me and provided possible solutions
Mar 29, 2025
Cheryl C.
He listened to me and asked all the right questions to figure out what was going on .
Mar 27, 2025
Kent B.
He is very knowledable and personnable.
Mar 22, 2025
Sarah V.
He was nice and very knowledgeable. Gave me peace of mind for my reasons for visiting.
Mar 21, 2025
Tyler O.
Timely, kind and professional care.
Mar 21, 2025
Michael S.
Awesome doctor and we make a plan 100% and follow up is very much appreciated 24/7
Mar 20, 2025
Jocelyn P.
Mar 20, 2025
Kayleigh S.
Mar 19, 2025
William L.
Mar 15, 2025
Lynda O.
Attentive and listened
Mar 10, 2025
Scott L.
Mar 10, 2025
Aryo N.
He is very knowledgeable, caring and personable
Mar 3, 2025
Brian D.
Super engaged, clearly knows what he is doing, left feeling like I was in a better place than when I walked in. Solid plan that I like and can follow. I trust the care he is providing.
Mar 3, 2025
Scott N.
Good communication, took care of a couple of issues and was able to get my blood test done.
Mar 3, 2025
David A.
Great provider!
Feb 27, 2025
Derek M.
Feb 26, 2025
Gilbert B.
He is very accommodating.
Feb 25, 2025
Jean H.
I am satisfied with every aspect of my care.
Feb 21, 2025
Nancy C.
Dr. Ah Sahn is such a good and caring PA. Always listens well and explores all avenues to any issue presented. Very knowledgeable and always willing to explain in detail symptoms and solutions.
Feb 19, 2025
Carlo A.
Feb 18, 2025
Kevin K.
It was great. It is unfortunate when doctor Cienciola which is my primary physician can no longer be available at your facility! Every occasion when I am sick, he is impossible to be reached . Perhaps it’s time for him to leave or for myself and my family to look into another care facility and not to visit memorial care anymore.
Feb 18, 2025
Patrick M.
Ryan is so thoughtful and kind.
Feb 18, 2025
Gregory G.
Ryan was personable, professional, informed, and very deliberate about my health, making sound recommendations which are actionable.Ryan is a credit to your team!
Feb 18, 2025
Victoria T.
Dr. San was very attentive and caring. Truly made an effort about my concerns coming in! He has great energy and i highly recommend him
Feb 17, 2025
David C.
His knowledge, patience and willingness to helpMe.
Feb 13, 2025
James M.
now he’s a great doctor. He’s been my doctor for three or four years. He’s really good. Keeps me updated on everything. I see him once a year for a check up but highly recommend.
Feb 10, 2025
Michele J.
He listened to me and was able to diagnose quickly
Feb 7, 2025
Eduardo P.
Feb 6, 2025
Dana G.
He was very kind very clear took time to explain things he is great
Feb 5, 2025
Joseph B.
Feb 5, 2025
Kym L.
Mr Keone Ah San was fast and efficient. I was in and out of the office in a jiffy. He is kind and listens to you.
Feb 5, 2025
Richard C.
He was a friendly physician and I felt comfortable there. The whole staff was very friendly.
Feb 5, 2025
Robert B.
My visit was very pleasant and very informative.
Feb 4, 2025
Michael H.
Ryan is very easy to communicate with and understands my health needs.
Feb 3, 2025
Kevin G.
Feb 3, 2025
Therese M.
On time
Feb 3, 2025
Precilla C.
Listened and was thorough.
Jan 31, 2025
Mayra N.
PA Ah San is always very courteous and professional. He always makes you feel comfortable and well taken care of.
Jan 30, 2025
Donald M.
Jan 30, 2025
Leticia S.
He pays attention to what I have to say and he listens to me. You don’t get that today with a lot of doctors. They’re always in a hurry.
Jan 30, 2025
Leonel B.
Excelente
Jan 28, 2025
Leticia P.
Very nice doctor
Jan 28, 2025
Russell B.
The Doctor is pleasant but direct and makes you comfortable.
Jan 27, 2025
Everett O.
I had trouble logging in to the zoom appointment, but Dr ryan took the time to call me directly on my cell phone to initiate our appointment.
Jan 27, 2025
Thomas B.
Best doctor I ever had
Jan 26, 2025
Raymond W.
Quick, accurate exam and proposed solution.
Jan 23, 2025
Lois M.
Helpful understanding, friendly and patience
Jan 22, 2025
Wendy T.
Ryan ah san is knowledgeable caring and kind.
Jan 20, 2025
Leonor G.
Jan 20, 2025
Beverly K.
This was my first time seeing him and he was very professional and took the time to talk with me and explain his assessment. He also made sure that I got an appointment with a specialist and necessary x-rays. I was overall very pleased with my appointment today.
Jan 17, 2025
David H.
His Bedside manner is Awesome
Jan 15, 2025
Dejan S.
Appreciate the details provided & quick meeting.
Jan 15, 2025
Erik G.
Very professional. Listens and cares. Follows up on previous visit discussions and shows a genuine interest in his patients’ health.
Jan 9, 2025
Ardis B.
Jan 8, 2025
Randy M.
Dr. Keone is pleasant, respectful, thorough, and I felt he has my best health interest in mind with his recommendations.
Jan 7, 2025
Herminia C.
He is a smart PA and understand your issues right away
Jan 6, 2025
Fernando V.
Easy to talk to, also cares about how you are doing. Does a great job explaining what is going on and how the medication you are taking will help or not.
Jan 6, 2025
Jeff G.
Knows me as a patient better than any doctor I have ever been associated with. Just a great, smart guy.
Jan 6, 2025
Alberto Y.
The best interaction with professional physician. The application portal is absolutely awesome!
Jan 6, 2025
Steven M.
PA-C Ryan always takes time to explain results, tests, medication, etc in detail, and always listens to my concerns and answers all my questions
Jan 6, 2025
William T.
Our family is very pleased with the attention that Dr. Ah San has shown our family. We hope that he stays at the R S M office.
Jan 6, 2025
Michael W.
Very thorough examination. Asks questions, reviews chart and answers based on individual medical history and background. A true professional and very detailed exam routine.
Jan 6, 2025
Juan F.
Dr. Ah San always takes the time to explain results or answer questions. More than that, he makes you feel like it's a partnership not just Dr. to patient relationship.
Jan 3, 2025
Ann D.
Dec 19, 2024
Joshua H.
Was easy
Dec 19, 2024
Lawrence G.
He was on time and spent a good amount of time going over my various issues.
Dec 19, 2024
Margaret F.
The doctor was friendly and thorough.
Dec 18, 2024
Manuel O.
Dec 18, 2024
Gail R.
I think he's wonderful. He's very thorough, helpful, and has a great bedside manner.
Dec 17, 2024
Jeffrey Y.
Dec 16, 2024
Denise M.
Very professional. Efficient and very friendly.. Looks for details of my medical to make sure everything is OK. Very clean office.
Dec 13, 2024
Laura D.
Dec 13, 2024
Marguerite F.
Caring, professional and understanding.Lab/xray department are wonderful
Dec 13, 2024
Kent B.
Very personable doctor. He doesnt treat you like "just another patient" and seems generally concerned about your well being.
Dec 11, 2024
Jonathan W.
Ryan is an excellent PCP.
Dec 10, 2024
Carlos S.
Dec 10, 2024
Debbie A.
Attentive. Great follow through.
Dec 9, 2024
Bridget F.
Always runs on time and always friendly and professional. The staff is amazing also.
Dec 6, 2024
Fabricio V.
Dec 6, 2024
Stephen P.
Mr Ah San has been taking care of us for years now. We trust him.
Dec 6, 2024
Perla A.
Addressed my concerns.
Dec 4, 2024
Thomas G.
He’s confident and very knowledgeable.he really cares about the people he’s treating.
Dec 4, 2024
Jeremy E.
10 out of 10, I am impressed with the amount of time and care that was spent with me during my visit. Office staff greats me with a smile and is always wonderful.
Dec 4, 2024
Ramon R.
Professional helpful friendly service
Dec 3, 2024
Charles D.
Nov 27, 2024
Paramjit K.
Nov 22, 2024
Miriam P.
Nov 22, 2024
Jadhiel G.
Nov 12, 2024
Lili D.
Nov 8, 2024
Naveed K.
Nov 6, 2024
Erin D.
Nov 6, 2024
Liliana A.
Nov 2, 2024
Natalie A.
Oct 31, 2024
Therese M.
Oct 26, 2024
Ketwakarn L.
Oct 25, 2024
Joe D.
Oct 21, 2024
Samantha C.
Oct 16, 2024
Scott L.
Oct 16, 2024
Alisa P.
Oct 5, 2024
Donn
Great experienceHe is patient and empathetic when interacting with patients. His knowledge is strong as well
Oct 2, 2024
Claudia B.
Sep 30, 2024
Reina B.
Sep 27, 2024
Marco P.
Sep 27, 2024
Ardis B.
Sep 24, 2024
Liang L.
Sep 18, 2024
Angela F.
Sep 15, 2024
Robert B.
Sep 9, 2024
Samantha W.
Aug 28, 2024
William T.
Aug 23, 2024
Kenneth D.
Ryan listens and is thoughtful with his patients
Aug 19, 2024
John D.
Aug 13, 2024
Michael C.
Aug 9, 2024
Tiffany L.
Aug 9, 2024
John S.
Aug 4, 2024
Greg W.
Jul 30, 2024
Anonymous
This man is the best!Since I started seeing him as my primary care pro he’s been nothing but attentive, caring and knowledgeable. He takes great care of me and I feel as if I’m speaking with a friend.
Jul 26, 2024
Jose A.
Jul 25, 2024
Chris L.
Jul 25, 2024
Leonor G.
Jul 22, 2024
David C.
Listens and puts thought into patients
Jul 15, 2024
Jeffrey R.
Jun 30, 2024
Marta R.
Jun 27, 2024
Timothy E.
Jun 27, 2024
Jay J.
Very pleasant first-time in-office visitMy first in-office appointment with Doctor R. Keone Ah San was great. He is very attentive, respectful, courteous, professional, objective and thorough.
Jun 26, 2024
Darien N.
Jun 25, 2024
Thomas W.
Jun 24, 2024
Christopher M.
Jun 24, 2024
Elizabeth C.
Very help and pay attention to what you’re saying
Jun 23, 2024
Eduardo P.
Jun 19, 2024
Emilia D.
Excellent
May 29, 2024
Julianne A.
He was attentive, thorough and gave excellent follow up instructions.
May 24, 2024
Melissa H.
May 22, 2024
Jairo M.
May 21, 2024
William T.
May 17, 2024
Manolito L.
All of my concerns were resolved.
May 16, 2024
Juan E.
Everthing is fast.
May 16, 2024
Kimberly F.
Listened to what I needed and helped me get well
May 16, 2024
Jeremy E.
Very caring and professional. Staff is great and friendly along with onsite radiology and lab. Top Class in healthcare in my opinion.
May 15, 2024
Jeffrey C.
Very positive and informative. Good communication. Likeable physician
May 14, 2024
Kelly M.
Very personable and willing to listen. Didn’t feel rushed.
May 14, 2024
Harry C.
Excellent care!
May 14, 2024
Jorge N.
He's straight forward and honest. He explains medical things in ways I can understand. He cares about my health. I never thought I'd like my Doctor or have a need to, but he's great.
May 10, 2024
Jessica W.
Always quick and efficient and thorough.
May 9, 2024
Dolores M.
He was very patient with me and put to rest some of my worries Thank you, Dr. Ryan
May 8, 2024
Jason N.
May 7, 2024
Shane M.
May 1, 2024
Kevin F.
May 1, 2024
Eric I.
Apr 30, 2024
Richard P.
he really cares about his patience, great attitude And a very kind man
Apr 29, 2024
Adrian M.
Apr 26, 2024
Roberto V.
Knowleable
Apr 25, 2024
Robert V.
Doctor Ryan has the absolute best bedside manner about him. He genuinely cares about your health concerns and does everything in his power to make things better.
Apr 24, 2024
Karen D.
Quick, efficient, & thorough visit.
Apr 22, 2024
Lewis S.
Apr 22, 2024
Nancy C.
Ryan has been my PA since moving to California 5 years ago. He is most caring, knowledgeable and extremely competent health care provider I have had in a very long time. Always takes the time to carefully explain procedures and or drugs.
Apr 19, 2024
Ashley D.
I always enjoy my dr
Apr 19, 2024
Linda B.
He always listens
Apr 18, 2024
Norma L.
Dr Ryan listen to my concern and always ensure that we get taken care of. I drive 1hr 10min because I don’t want to chance my doctor! Thank you so much Dr Ryan
Apr 18, 2024
Dennis P.
Very practical. Easy to talk to.
Apr 18, 2024
Maciej P.
Apr 17, 2024
Marguerite F.
Ryan Keone has been my PCP for many years. I have 100% trust and appreciate his professionalism.
Apr 15, 2024
Johnson L.
Very knowledgeable was able to fit me in for an Xray. He discussed our next steps thoroughly.
Apr 12, 2024
James S.
Took time to get at what the issue was.
Apr 12, 2024
Karen C.
Listened to my concerns and responded appropriately.
Apr 11, 2024
Michael W.
Keone Ah San is a true professional. He listened to my concerns, quickly diagnosed what the problem was and provided a solution. He is thorough and detailed in all aspects of the exam. Highly recommend.
Apr 10, 2024
Edgar V.
The staff at Memorial Care is always very professional and efficient. Dr. Ah San is just amazing. He is incredibly knowledgeable and very precise with his assessments and recommendations. I have been going to Memorial Care for the last nine years and would not change it. Thank you, Memorial Care!
Apr 10, 2024
Mayra N.
I’m so bless to have Dr Keone Ah San as my Doctor.
Apr 10, 2024
Randall O.
Super attentive covers every issue fast and precise can’t say enough !
Apr 10, 2024
Brett C.
I feel my that my doctor has my best interest at heart. He is the best doctor I’ve ever had and I appreciate all the good advice that he gives me.
Apr 5, 2024
Alejandro G.
very professional and answered all my questions
Apr 4, 2024
Denise L.
I have been seeing Mr AhSan for many years. I completely trust him with my healthcare and highly recommend him to friends and family.
Apr 3, 2024
Jennifer K.
Dr. Ah San is a very patient, caring, and thorough health professional. He always goes above and beyond to ensure that I get the best care at every visit. He listens and offers recommendations based upon his knowledge and experience but also like I am a member of his family.
Apr 2, 2024
Mindy C.
Apr 2, 2024
Teresa B.
Profesional
Apr 1, 2024
Steven M.
Dr Ryan listened to my symptoms and quickly scheduled tests to rule in/out the most likely illnesses. Results of the first tests were available in 10 minutes before I left the office
Apr 1, 2024
Irene G.
Easy to talk to, thorough, knowledgeable, I can tell he looks out for my best health interest
Apr 1, 2024
Genero R.
Very attentive and listen to patient concerns
Apr 1, 2024
Larry B.
Mar 29, 2024
Lois M.
Listened and explained, was very thorough. A good experience.
Mar 29, 2024
Justine M.
He listens intently and provides information at the level I need it. I'm a nurse and he supplies evidence and rationale along with the recommended treatment. I leave knowing that I'm a critical decision maker in my care.
Mar 29, 2024
Leticia P.
My favorite doctor
Mar 28, 2024
Jonimarie M.
Patiently answered all my questions.
Mar 28, 2024
Nancy W.
I love Dr. Ryan!!!
Mar 28, 2024
Robert D.
Very patient and thorough
Mar 27, 2024
Erik B.
Mar 27, 2024
Herminia C.
It was quick and the doctor ask me to get Covid immunization for my protection
Mar 21, 2024
Daniel F.
The best person I can imagine looking after my health. Simply put, I know that this man cares about me as a person as well as a patient. You really need to give him a raise. A big one!
Mar 20, 2024
Russell B.
Very straight forward. Also his Asst. Cindy very helpful.
Mar 19, 2024
Laurie T.
Dr Ah San was very thorough and a good listener. I didn’t feel rushed and felt that he genuinely cared about me. He was very personable and professional.
Mar 19, 2024
Lisa P.
Always have a positive experience
Mar 18, 2024
Barry I.
Ryan is great. The one thing I didn't like about the overall experience is that I completed all the questionaires the first time I was asked to yet I still received almost daily notices that I needed to complete forms. Mostly just annoying but also very inefficient.
Mar 15, 2024
Eduardo P.
Mar 14, 2024
Stephen M.
Professional smart to the point
Mar 13, 2024
Juan F.
He was very attentive and listen to my concerns. He was great about explaining things an coming up with a game plan on treatment. Highly recommend him and happy I made the swith to him as my PCP!
Mar 13, 2024
Katherine H.
I’ve see Mr. Ah San for several years now. He knows my medical history and I trust him. His team is helpful and knowledgeable as well.
Mar 11, 2024
Cheryl G.
He is very through and looks for options to keep me on track. Great to have as my primary. He really cares about me getting to optimum health.
Mar 11, 2024
Liza Z.
He was very thorough and the utmost professional.
Mar 8, 2024
Christopher M.
He is awesome.
Mar 8, 2024
Benjamin W.
Mar 7, 2024
Shammi
One of the bestRyan took time to listen, analyse and understand my health and previous illnesses as well as did the necessary to manage preventive care.
Mar 7, 2024
Carol K.
I felt listened to, appreciate the support moving forward and left exam feeling positive about improving my health with guidelines discussed.
Mar 6, 2024
Wickramasinghe S.
Care given, time taken and commitment from him in managing my health.
Mar 5, 2024
Gail
Highly recommendRyan quickly addressed the issue and suggests the best treatment. He indicated that he'd already reviewed my medical history before cominf in to meet with me so he was equipped to recommend the best treatment plan for me. He listens, he's knowledgeable, very relateable, and follows through. I fully trust him as a health care professional.
Mar 4, 2024
Gail R.
He quickly addresses the issue and suggests the best treatment. He indicated that he'd already reviewed my medical history so could recommend next steps. He listens, he's knowledgeable, very relateable, and follows through with a treatment plan. I fully trust him as a healrh care professional.
Feb 29, 2024
Alan P.
Great competence and cares for his patients yet is quick and efficient
Feb 28, 2024
Felicia D.
Great job! Helped me navigate my needs well with amazing follow through.
Feb 28, 2024
Maureen K.
He knows me as a patient well, great Dr.
Feb 28, 2024
Josue P.
He looked up everything I needed to have like I was missing a shot n gave it to me Was really helpful with every question I had.
Feb 28, 2024
Jose J.
I had a great experience over all! Amazing and friendly staff
Feb 28, 2024
Tim D.
His honesty and good humor.
Feb 27, 2024
Joe G.
Always makes me feel relaxed and confident that I am in good hands. You
Feb 26, 2024
Valerie H.
Feb 26, 2024
Dejan S.
Feb 21, 2024
Jason W.
Personalized, professional and knowledgeable!
Feb 21, 2024
Richard B.
Feb 21, 2024
Allison M.
Feb 19, 2024
Anne G.
He knows what he is talking about. Very confident and will explain options very well.
Feb 18, 2024
Juventino F.
He took time to look over my previous visits to the ER to see what was my problem.
Feb 16, 2024
Kevin R.
Ryan is always on time and listens attentively to all being discussed and is not dismissive and takes quick action.
Feb 16, 2024
Danielle J.
Listens and is knowledgeable
Feb 15, 2024
THartlett
Great experience thus far!I started using Dr Ah San in November 2023 as I moved to CA from CT. I'm most impressed with provided detailed information regarding any questions I had regarding my test results and subsequent treatment plan. I highly recommend Dr Ah San.
Feb 15, 2024
Joan E.
Mr. Ah SanMr. Ah San always takes his time with me. He answers all my questions and then before I leave, he asks me if he can help me with anything else.
Feb 15, 2024
Ivan O.
Ryan’s has the ability to understand how I feel and provides the best expectations as to why I am experiencing this pain and he follows up with all of the options available to remedy this problem and assist me with the best solution to my problem
Feb 15, 2024
Kristin R.
Dr AhSan is kind and I can tell he knows what he is talking about. Very knowledgeable. Makes me feel calm about any concerns I bring to him.
Feb 14, 2024
Joan E.
Mr. Ah San always takes his time with me. He answers all my questions and then before I leave, he asks me if he can help me with anything else.
Feb 14, 2024
Alberto Y.
He is great on what he does , the experience that he progresses is outstanding.
Feb 14, 2024
Scott K.
It was quick and easy. No time consuming paperwork.
Feb 13, 2024
Marta R.
R. Keone Ah San, PA-C. - He listens to my questions and concerns. Has emphatic to my pain and keeps me updated on my health exams. He is a professionals and makes me feel comfortable.
Feb 6, 2026
Bruce B.
He genuine, honest, and to the point. Just the way I like it. Does’nt was my time. Have a good day.
Jan 15, 2026
Mohammad N.
Dec 6, 2025
Steven M.
Oct 27, 2025
Deepali S.
Very thorough!
Oct 16, 2025
Kathryn L.
He was thorough, followed up with test results, and treatment plan
Oct 13, 2025
Le A.
Always thorough
Sep 28, 2025
Stephen P.
Mr Ah San takes care of us.
Sep 5, 2025
Steve R.
Thorough, super nice, always prompt
Sep 2, 2025
Penelope A.
Very good at listening and explaining.
Aug 28, 2025
Laura W.
Thorough
Aug 11, 2025
Caroline C.
Thorough
Aug 6, 2025
Joseph T.
O professionalism, knowledge
Jun 19, 2025
Taranjit A.
Nice guy, easy to talk to and go over problems
Jun 17, 2025
April A.
Timely
Jun 17, 2025
Paul V.
Dr explained what was wrong with my blood pressure.
May 2, 2025
Michael C.
Feb 20, 2025
Marcella C.
He was very through explained prescriptions and listened to my concerns
Jan 26, 2025
Ronnie L.
Jan 21, 2025
Eric C.
friendly competent medical professional
Dec 3, 2024
Raymond B.
He is very knowledgeable and to the point. He helped diagnose my Siatic nerve pain in my back in January of this year. He’s great..!!
Nov 18, 2024
Jesse O.
Sep 23, 2024
Heather L.
Aug 6, 2024
April A.
Timely
May 13, 2024
Mark N.
Good doctor
Apr 7, 2024
Martin H.
Apr 3, 2024
Dawn I.
Mar 28, 2024
Christy M.
Very through, listened
Mar 11, 2024
Athanasia H.
He was very knowledgeable not only the reason for my visit, but also the medication I am on.
Feb 21, 2024
Rowena F.
Feb 14, 2024
Bruce L.
Mar 4, 2026
Alexandra M.
Dec 9, 2025
Sitao W.
Nov 26, 2025
Leon C.
Always a positive experience talking to that doctor
Nov 26, 2025
Megan W.
Nov 20, 2025
Debra R.
Oct 15, 2025
Solavuth T.
Good
May 23, 2025
Deborah F.
He spoke directly to me, listened to me, looked at my file and medical history and then discussed with me what he believed would help me and then reviewed with me what to look for in the coming days and what I should be feeling. He also said if In the next few days it didn’t go as we hoped and/or my symptoms worsen what I should do and where I should go.
Apr 3, 2025
Marina M.
He was personable and answered all my questions.
Mar 21, 2025
James S.
Much better the second time around
Mar 19, 2025
Solavuth T.
Thanks
May 11, 2025
Michael P.
No Comment
Feb 25, 2025
Austin T.
He was good, quick and straight to the point.
Jan 31, 2025
Pamyla L.
No Comment
Oct 3, 2025
Tina T.
No Comment
Jan 7, 2025
Jennifer B.
No Comment
Mar 28, 2025
Kate S.
No Comment
Oct 21, 2025
Shahzad M.
No Comment
Source: Reviews are aggregated from third-party review sites such as Facebook, Google, HealthGrades, RepuGen, Vitals, WebMD, and Yelp.