William F. Baker Jr., M.D.
NPI 1720040793ActiveIndividual· Internal Medicine· Bakersfield, CA
Internal Medicine (M.D.) in Bakersfield, California, trained at University of California, Irvine, California College of Medicine (class of 1975). Their prescriptions cost Medicare Part D more than their services did: $1,430,982 for 12,926 claims, against $846,665 paid for services in 2024. Amgen Inc. was the largest of 22 companies reporting payments in 2025, $1,482 in all, mostly food and beverage.
Overview
| NPI | 1720040793 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 5, 2006 |
| Last updated in NPPES | Jun 11, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G32298 | 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 | 989 |
|---|---|
| Services billed | 28,870 across 163 procedure codes |
| Paid by Medicare | $846,665 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,926 · 24,781 30-day fills |
|---|---|
| Patients | 877 |
| Total drug cost | $1,430,982 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of California, Irvine, California College of Medicine |
|---|---|
| Graduation year | 1975 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Centric HealthBakersfield, CA · 68 clinicians
Hospital affiliations
- Adventist Health BakersfieldBakersfield, CA
- Bakersfield Memorial HospitalBakersfield, CA
- Kern Valley Healthcare DistrictLake Isabella, CA
- Ridgecrest Regional HospitalRidgecrest, CA
- Stanford Health CareStanford, CA
Other facilities
- Adventist Health Home Care ServicesHome health agency · Bakersfield, CA
- Around the Clock Home CareHome health agency · Bakersfield, CA
- Mercy-Memorial Home HealthHome health agency · Bakersfield, CA
- Purpose Driven Home Health, LLCHome health agency · Bakersfield, CA
- Reliable Healthcare LLCHome health agency · Bakersfield, CA
Industry payments (Open Payments)
- 2025$1,482 · 80 payments from 22 companies
- 2024$1,089 · 69 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $207.43 | 20 |
| Heartflow, Inc. | $190.75 | 3 |
| Glaxosmithkline, LLC. | $166.66 | 14 |
| Abbvie Inc. | $157.66 | 9 |
| Pfizer Inc. | $132.62 | 6 |
What the 2025 payments were for
- Food and Beverage$1,482 · 80 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 280 internal medicine physicians in Bakersfield · All internal medicine physicians in California