About Me

*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.



Provider Specialty

Physician Assistant, Primary Care

Areas of Care



Emory University School of Medicine - PA

Locations & Affiliations


MemorialCare Medical Group - Rancho Santa Margarita

29472 Avenida de las Banderas

Rancho Santa Margarita, CA

Office: (877) 696-3622

Insurances Accepted

United HealthCare PPO
TriCare West(HN)/TriWest Healthcare(BSC)
Humana PPO
Health Net PPO
Cigna PPO
Blue Shield PPO
Anthem PPO
Aetna PPO
Centivo ACO
Primary Care First ACO
Anthem Commercial HMO
Cigna Commercial HMO
Aetna Commercial HMO
Health Net Commercial HMO
BlueShield Commercial HMO
UHC Commercial HMO
Aetna Medicare Advantage HMO
Alignment Medicare Advantage HMO
SCAN Medicare Advantage HMO
Health Net Medicare Advantage HMO
Humana Medicare Advantage HMO
UHC AARP Medicare Advantage HMO
Anthem Pathway HMO
Anthem Vivity HMO
BlueShield Trio Commercial HMO
Cigna Value/Select HMO
UHC Harmony Commercial HMO
Clever Care Medicare Advantage HMO