Nathan Birnbaum, MD
NPI 1336601517ActiveIndividual· Family Medicine· Santa Rosa, CA
Family Medicine (MD) with Unm Medical Group Inc, practicing in Santa Rosa, California. Their prescriptions cost Medicare Part D more than their services did: $1,070,703 for 2,599 claims, against $23,839 paid for services in 2024. Merck Sharp & Dohme LLC reported $16.03 in payments in 2025, mostly food and beverage. Lists Unm Hospital as a hospital affiliation.
Overview
| NPI | 1336601517 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 5, 2019 |
| Last updated in NPPES | Oct 30, 2026 |
| Certified by provider | Oct 28, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | C211737 | CA |
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 - Family Practice (NM) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 127 |
|---|---|
| Services billed | 412 across 33 procedure codes |
| Paid by Medicare | $23,839 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,599 · 3,800 30-day fills |
|---|---|
| Patients | 219 |
| Total drug cost | $1,070,703 |
| Generic share | 77% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- Unm Medical Group IncAlbuquerque, NM · 1,047 clinicians
Hospital affiliation
- Unm HospitalAlbuquerque, NM
Industry payments (Open Payments)
- 2025$16.03 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $16.03 | 1 |
What the 2025 payments were for
- Food and Beverage$16.03 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 298 family medicine physicians in Santa Rosa · All family medicine physicians in California