James C.S. Hahn, M.D.
NPI 1033293634ActiveIndividual· Internal Medicine· Los Angeles, CA
Internal Medicine (M.D.) in Los Angeles, California, licensed in CA, with an NPI issued in October 2006. Their prescriptions cost Medicare Part D more than their services did: $1,160,973 for 8,792 claims, against $7,144 paid for services in 2024. Gilead Sciences, Inc. was the largest of 9 companies reporting payments in 2025, $1,078 in all, mostly food and beverage.
Overview
| NPI | 1033293634 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 24, 2006 |
| Last updated in NPPES | Oct 11, 2023 |
| Certified by provider | Oct 11, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A36933 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 53 |
|---|---|
| Services billed | 127 across 10 procedure codes |
| Paid by Medicare | $7,144 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,792 · 19,907 30-day fills |
|---|---|
| Patients | 643 |
| Total drug cost | $1,160,973 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 1975 |
|---|---|
| Medicare specialty | Internal Medicine |
Industry payments (Open Payments)
- 2025$1,078 · 42 payments from 9 companies
- 2024$759.54 · 32 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $314.93 | 13 |
| Abbvie Inc. | $166.23 | 6 |
| Novo Nordisk Inc | $139.02 | 9 |
| Aimmune Therapeutics, Inc. | $134.58 | 5 |
| Abbott Laboratories | $109.81 | 1 |
What the 2025 payments were for
- Food and Beverage$1,078 · 42 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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