Oliver Lee Mason, MD
NPI 1871606434ActiveIndividual· Internal Medicine· Cerritos, CA
Internal Medicine (MD) in Cerritos, California, trained at University of California, San Francisco School of Medicine (class of 1984). 114 Medicare patients in 2024, $24,169 paid; nearly all of their 416 Part D prescriptions were generic (94%). Teva Pharmaceuticals USA, Inc. reported $66.37 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1871606434 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Aug 17, 2006 |
| Last updated in NPPES | Feb 4, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G56462 | 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 | 114 |
|---|---|
| Services billed | 323 across 5 procedure codes |
| Paid by Medicare | $24,169 |
Part D prescriptions in 2024
| Prescriptions (claims) | 416 · 440 30-day fills |
|---|---|
| Patients | 129 |
| Total drug cost | $24,052 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | University of California, San Francisco School of Medicine |
|---|---|
| Graduation year | 1984 |
| Medicare specialty | Internal Medicine |
Industry payments (Open Payments)
- 2025$66.37 · 3 payments from 1 company
- 2024$143.88 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Teva Pharmaceuticals USA, Inc. | $66.37 | 3 |
What the 2025 payments were for
- Food and Beverage$66.37 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 36 internal medicine physicians in Cerritos · All internal medicine physicians in California