Ruth Hwang, MS, PA-C
NPI 1821332156ActiveIndividual· Physician Assistant· Fullerton, CA
Physician Assistant (MS, PA-C) with David Ahn MD Inc, practicing in Fullerton, California. Their prescriptions cost Medicare Part D more than their services did: $932,450 for 1,394 claims, against $26,365 paid for services in 2024. Corcept Therapeutics was the largest of 9 companies reporting payments in 2025, $842.73 in all, mostly food and beverage. Lists Hoag Memorial Hospital Presbyterian and 1 other hospital as hospital affiliations.
Overview
| NPI | 1821332156 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MS, PA-C |
| Sole proprietor | No |
| NPI issued | Nov 27, 2012 |
| Last updated in NPPES | Oct 19, 2020 |
| Certified by provider | Oct 19, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 5211 | AZ |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 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 | 111 |
|---|---|
| Services billed | 444 across 7 procedure codes |
| Paid by Medicare | $26,365 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,394 · 3,154 30-day fills |
|---|---|
| Patients | 175 |
| Total drug cost | $932,450 |
| Generic share | 31% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- David Ahn MD IncNewport Beach, CA · 4 clinicians
Hospital affiliations
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$842.73 · 27 payments from 9 companies
- 2024$1,543 · 43 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $315.62 | 9 |
| Novo Nordisk Inc | $297.05 | 7 |
| Sequel Med Tech, LLC | $68.75 | 3 |
| Lilly USA, LLC | $47.89 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $33.36 | 1 |
What the 2025 payments were for
- Food and Beverage$842.73 · 27 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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