Clan Hyoku Hahn, M.D.
NPI 1023043189ActiveIndividual· Internal Medicine, Hematology & Oncology· Los Angeles, CA
Internal Medicine, Hematology & Oncology (M.D.) in Los Angeles, California, trained at Loma Linda University School of Medicine (class of 1992). Their prescriptions cost Medicare Part D more than their services did: $4,215,450 for 1,611 claims, against $212,485 paid for services in 2024. Novartis Pharmaceuticals Corporation was the largest of 40 companies reporting payments in 2025, $6,244 in all, mostly food and beverage.
Overview
| NPI | 1023043189 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 11, 2006 |
| Last updated in NPPES | Jul 12, 2022 |
| Certified by provider | Jul 12, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | G78245 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 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 | 261 |
|---|---|
| Services billed | 5,066 across 38 procedure codes |
| Paid by Medicare | $212,485 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,611 · 1,876 30-day fills |
|---|---|
| Patients | 210 |
| Total drug cost | $4,215,450 |
| Generic share | 69% of claims |
Education and affiliations
| Medical school | Loma Linda University School of Medicine |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Hematology/Oncology |
Hospital affiliations
- Hollywood Presbyterian Medical CenterLos Angeles, CA
- Pih Health Good Samaritan HospitalLos Angeles, CA
Industry payments (Open Payments)
- 2025$6,244 · 241 payments from 40 companies
- 2024$4,216 · 165 payments from 33 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $829.30 | 17 |
| Genzyme Corporation | $521.63 | 12 |
| Celgene Corporation | $480.68 | 27 |
| Pfizer Inc. | $415.09 | 24 |
| E.R. Squibb & Sons, L.L.C. | $391.28 | 24 |
What the 2025 payments were for
- Food and Beverage$5,663 · 234 payments
- Long term medical supply or device loan$498.50 · 5 payments
- Education$69.00 · 1 payment
- Entertainment$13.62 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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