Ryan K. Ah San, PA-C
NPI 1013181346ActiveIndividual· Physician Assistant, Medical· Rancho Santa Margarita, CA
Physician Assistant, Medical (PA-C) with Memorialcare Medical Foundation, practicing in Rancho Santa Margarita, California. Their prescriptions cost Medicare Part D more than their services did: $214,267 for 1,837 claims, against $15,629 paid for services in 2024. Novo Nordisk Inc was the largest of 2 companies reporting payments in 2025, $106.32 in all, mostly education. Lists Memorialcare Saddleback Medical Center as a hospital affiliation.
Overview
| NPI | 1013181346 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Apr 17, 2008 |
| Last updated in NPPES | Mar 9, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant, Medical Primary | 363AM0700X | PA15744 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 120 |
|---|---|
| Services billed | 380 across 37 procedure codes |
| Paid by Medicare | $15,629 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,837 · 4,297 30-day fills |
|---|---|
| Patients | 274 |
| Total drug cost | $214,267 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2000 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Memorialcare Medical FoundationLong Beach, CA · 566 clinicians
Hospital affiliation
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
Industry payments (Open Payments)
- 2025$106.32 · 4 payments from 2 companies
- 2024$55.36 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $86.89 | 3 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $19.43 | 1 |
What the 2025 payments were for
- Education$64.54 · 2 payments
- Food and Beverage$41.78 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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