Ryan K. Ah San, PA-C
Medical Physician Assistant · Rancho Santa Margarita, CA
Ryan K. Ah San, PA-C is a medical physician assistant with a practice address in Rancho Santa Margarita, California, and NPI 1013181346, issued on Apr 17, 2008. Check the license (California PA15744, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ryan K. Ah San
- Credential
- PA-C
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- PA15744 CA
Self-reported in NPPES; status is on the state search - Practice location
- 29472 Avenida DE Las Bandera, Rancho Santa Margarita, CA 92688
- Phone
- (949) 459-9968
- Enumerated
- Apr 17, 2008
- Record last updated
- Mar 9, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (949) 766-2565
- Medicare enrollment
- Enrolled (PECOS I20080811000649); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Also registered at 29472 Avenida DE Las Bandera
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mark Cianciola, MDFamily Medicine Physician1750371035
- Daizy Engineer, MDPediatrics Physician1467442897
- Monique Johnson, PHARM.D.Pharmacist1568641637
- Kenneth Kazenelson, M.D.Family Medicine Physician1275539637
- Sumant Nagarkar, MDFamily Medicine Physician1316938871
- Bonnie Pittaluga, MDPediatrics Physician1437135019
Verify Ryan K. Ah San in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA15744Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% more Medicare Part D claims than the average medical physician assistant in 2024
1,837 Medicare Part D claims for 274 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 22 claims were for opioids.
Most prescribed
- Atorvastatin Calcium134 claims
- Losartan Potassium72 claims
- Lisinopril58 claims
- Ozempic53 claims
- Amlodipine Besylate52 claims
- Levothyroxine Sodium51 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $55.36
1 payment: food and beverage; the largest payer was Medtronic, Inc. The 16,165 providers of this specialty with any payment received $1,055.00 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Memorialcare Medical FoundationIrvine, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ryan K. Ah San among 3,376 medical physician assistant records in California
Ryan K. Ah San, PA-C is one of 3,376 medical physician assistant records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 32% of them.
- NPI issued2008 · 32% of these records are older, 62% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2000 · median 2012 among the 1,347 with a school on file
- Record last updated2016 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in California
There are 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in Rancho Santa Margarita → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Tri Tran, PA-CRancho Santa Margarita, CA 926881427447713
- Levi Williamson, PA-CRancho Santa Margarita, CA 926881932672615
- Barbara Witowska, MS PACRancho Santa Margarita, CA 926881013034230
- Jaehyun Cho, PAMission Viejo, CA 926911053952002
- Jessica Cummings, PA-CMission Viejo, CA 926911033480942
- Nafise Dolan, PA-CMission Viejo, CA 926911588260616
- Nicole Franklin, P.A.-CMission Viejo, CA 926911215023718
- Natasha Maylor, PA-CMission Viejo, CA 926911275497745
Common questions
What is Ryan K. Ah San, PA-C's NPI number?
Ryan K. Ah San, PA-C's National Provider Identifier (NPI) is 1013181346, issued on Apr 17, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Ryan K. Ah San, PA-C located?
The NPPES record lists a practice address at 29472 Avenida DE Las Bandera, Rancho Santa Margarita, CA, 92688. Phone: (949) 459-9968. Providers update this record themselves, so call before visiting.
How can I verify Ryan K. Ah San, PA-C's license?
NPPES lists California license number PA15744, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ryan K. Ah San, PA-C prescribe under Medicare Part D?
In 2024, Ryan K. Ah San, PA-C had 1,837 Medicare Part D claims for 274 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.