Hillary A. Hahm, MD, PHD
NPI 1801890280ActiveIndividual· Internal Medicine, Hematology & Oncology· Marietta, GA
Internal Medicine, Hematology & Oncology (MD, PHD) in Marietta, Georgia, trained at Johns Hopkins University School of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $1,954,144 for 1,617 claims, against $52,216 paid for services in 2024. Janssen Biotech, Inc. was the largest of 7 companies reporting payments in 2025, $328.07 in all, mostly food and beverage.
Overview
| NPI | 1801890280 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Jun 13, 2005 |
| Last updated in NPPES | Jun 10, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 048051 | GA |
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 - Hematology/Oncology (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 363 |
|---|---|
| Services billed | 975 across 8 procedure codes |
| Paid by Medicare | $52,216 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,617 · 2,836 30-day fills |
|---|---|
| Patients | 312 |
| Total drug cost | $1,954,144 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Johns Hopkins University School of Medicine |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Hematology, Medical Oncology |
Medical group
- Wellstar Medical Group LLCMarietta, GA · 3,093 clinicians
Hospital affiliations
- Piedmont Cartersville Medical CenterCartersville, GA
- Tanner Medical Center Villa RicaVilla Rica, GA
- Wellstar Cobb Medical CenterAustell, GA
- Wellstar Kennestone Regional Medical CenterMarietta, GA
Other facilities
- Wellstar Windy Hill HospitalLong-term care hospital · Marietta, GA
Industry payments (Open Payments)
- 2025$328.07 · 12 payments from 7 companies
- 2024$769.86 · 37 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $95.00 | 1 |
| Astrazeneca Pharmaceuticals LP | $72.03 | 3 |
| Biocon Biologics Inc | $58.36 | 3 |
| Abbvie Inc. | $46.80 | 2 |
| Pfizer Inc. | $23.02 | 1 |
What the 2025 payments were for
- Food and Beverage$233.07 · 11 payments
- Education$95.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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