Matthew Nienaber, D.O.
NPI 1033535182ActiveIndividual· Internal Medicine· Santa Monica, CA
Internal Medicine (D.O.) with Providence Saint Johns Medical Foundation and 1 other group, practicing in Santa Monica, California. Their prescriptions cost Medicare Part D more than their services did: $264,033 for 2,803 claims, against $43,798 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 11 companies reporting payments in 2025, $857.09 in all, mostly food and beverage. Lists Saint John's Health Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1033535182 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Mar 13, 2014 |
| Last updated in NPPES | May 28, 2026 |
| Certified by provider | May 28, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20A14759 | 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 | 116 |
|---|---|
| Services billed | 653 across 30 procedure codes |
| Paid by Medicare | $43,798 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,803 · 6,060 30-day fills |
|---|---|
| Patients | 233 |
| Total drug cost | $264,033 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Providence Saint Johns Medical FoundationSanta Monica, CA · 281 clinicians
- Svmhs ClinicsSalinas, CA · 259 clinicians
Hospital affiliations
- Saint John's Health CenterSanta Monica, CA
- Salinas Valley Health Medical CenterSalinas, CA
Other facilities
- Providence Home Health la County SouthHome health agency · Torrance, CA
Industry payments (Open Payments)
- 2025$857.09 · 38 payments from 11 companies
- 2024$329.41 · 14 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $226.24 | 10 |
| Gilead Sciences, Inc. | $125.94 | 4 |
| Lilly USA, LLC | $113.75 | 5 |
| Abbvie Inc. | $110.80 | 5 |
| Amgen Inc. | $83.29 | 4 |
What the 2025 payments were for
- Food and Beverage$857.09 · 38 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 197 internal medicine physicians in Santa Monica · All internal medicine physicians in California