Marilyn Mae McGowan, MD
NPI 1417586835ActiveIndividual· Internal Medicine· San Luis Obispo, CA
Internal Medicine (MD) in San Luis Obispo, California, trained at Georgetown University School of Medicine (class of 2020). In 2024 Medicare paid $85,147 for 440 patients, and Part D covered 347 of their prescriptions, 81% of them generic. Janssen Biotech, Inc. was the largest of 4 companies reporting payments in 2025, $83.80 in all, mostly food and beverage.
Overview
| NPI | 1417586835 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 7, 2020 |
| Last updated in NPPES | Aug 27, 2024 |
| Certified by provider | Aug 27, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A193400 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA); Practitioner - Internal Medicine (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 440 |
|---|---|
| Services billed | 864 across 34 procedure codes |
| Paid by Medicare | $85,147 |
Part D prescriptions in 2024
| Prescriptions (claims) | 347 · 585 30-day fills |
|---|---|
| Patients | 170 |
| Total drug cost | $44,776 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 2020 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
- David B. HammerTempleton, CA · 123 clinicians
Hospital affiliations
- Adventist Health Sierra VistaSan Luis Obispo, CA
- French Hospital Medical CenterSan Luis Obispo, CA
- Marian Regional Medical CenterSanta Maria, CA
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
Other facilities
- Aevum Home HealthHome health agency · San Luis Obispo, CA
- Central Coast Home Health IncHome health agency · San Luis Obispo, CA
- Dignity Health Home HealthHome health agency · Santa Maria, CA
Industry payments (Open Payments)
- 2025$83.80 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $34.16 | 1 |
| Pfizer Inc. | $19.78 | 1 |
| Lilly USA, LLC | $15.46 | 1 |
| Tandem Diabetes Care, Inc. | $14.40 | 1 |
What the 2025 payments were for
- Food and Beverage$83.80 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in San Luis Obispo
- 1922294800
- 1295605475
- 1811929417
- 1366392987
- 1861180945
- 1043641103
- 1295925105
- 1033673173
- 1457781841
- 1629321849
- 1962567362
- 1861475154