Sang Hoon Ahn, M.D.
NPI 1568581759ActiveIndividual· Internal Medicine· Fullerton, CA
Internal Medicine (M.D.) with Usc Care Medical Group Inc, practicing in Fullerton, California. Their prescriptions cost Medicare Part D more than their services did: $8,455,302 for 1,278 claims, against $84,695 paid for services in 2024. Tempus Ai, Inc was the largest of 4 companies reporting payments in 2025, $124.29 in all, mostly food and beverage. Lists Keck Hospital of Usc and 1 other hospital as hospital affiliations.
Overview
| NPI | 1568581759 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 28, 2007 |
| Last updated in NPPES | Feb 18, 2026 |
| Certified by provider | Feb 18, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A95562 | CA |
| Internal Medicine, Medical Oncology | 207RX0202X | A95562 | 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 - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 512 |
|---|---|
| Services billed | 1,328 across 11 procedure codes |
| Paid by Medicare | $84,695 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,278 · 1,618 30-day fills |
|---|---|
| Patients | 213 |
| Total drug cost | $8,455,302 |
| Generic share | 50% of claims |
Education and affiliations
| Graduation year | 1994 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- Usc Care Medical Group IncLos Angeles, CA · 1,380 clinicians
Hospital affiliations
- Keck Hospital of UscLos Angeles, CA
- Providence St. Jude Medical CenterFullerton, CA
Other facilities
- Mission Home Health Services, IncHome health agency · Los Angeles, CA
- Western Home Care, IncHome health agency · Buena Park, CA
Industry payments (Open Payments)
- 2025$124.29 · 4 payments from 4 companies
- 2024$48.36 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Tempus Ai, Inc | $48.28 | 1 |
| Janssen Biotech, Inc. | $28.31 | 1 |
| Merck Sharp & Dohme LLC | $25.70 | 1 |
| Telix Pharmaceuticals | $22.00 | 1 |
What the 2025 payments were for
- Food and Beverage$98.59 · 3 payments
- Education$25.70 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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