Russell M. Greif, D.O.
NPI 1669519765ActiveIndividual· Internal Medicine· Lancaster, CA
Internal Medicine (D.O.) in Lancaster, California, trained at College of Osteo Med of the Pacific at Pomona (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $340,752 for 2,989 claims, against $209,496 paid for services in 2024. Amgen Inc. was the largest of 7 companies reporting payments in 2025, $661.95 in all, mostly food and beverage.
Overview
| NPI | 1669519765 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Jan 30, 2007 |
| Last updated in NPPES | Dec 13, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20A5410 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 270 |
|---|---|
| Services billed | 2,712 across 39 procedure codes |
| Paid by Medicare | $209,496 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,989 · 5,885 30-day fills |
|---|---|
| Patients | 192 |
| Total drug cost | $340,752 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | College of Osteo Med of the Pacific at Pomona |
|---|---|
| Graduation year | 1986 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Antelope Valley HospitalLancaster, CA
- Palmdale Regional Medical CenterPalmdale, CA
Other facilities
- Blue Sky Home Health Care, IncHome health agency · Van Nuys, CA
- Trusted Path Home Health IncHome health agency · Van Nuys, CA
Industry payments (Open Payments)
- 2025$661.95 · 19 payments from 7 companies
- 2024$634.05 · 11 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $159.64 | 4 |
| Otsuka America Pharmaceutical, Inc. | $151.92 | 10 |
| Phathom Pharmaceuticals, Inc. | $140.85 | 1 |
| Abbvie Inc. | $123.16 | 1 |
| Lilly USA, LLC | $32.43 | 1 |
What the 2025 payments were for
- Food and Beverage$661.95 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Lancaster
- 1144493131
- 1164713244
- 1255466835
- 1265590525
- 1346745262
- 1588655450
- 1639276140
- 1639277130
- 1720199763
- 1760007116
- 1851401988
- 1851616775
All 79 internal medicine physicians in Lancaster · All internal medicine physicians in California