John P. Williams, D.O.
NPI 1144220369ActiveIndividual· Internal Medicine· Willits, CA
Internal Medicine (D.O.) in Willits, California, trained at University of New England, College of Osteo Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $1,049,391 for 11,847 claims, against $132,809 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 7 companies reporting payments in 2025, $373.88 in all, mostly food and beverage.
Overview
| NPI | 1144220369 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Jul 29, 2005 |
| Last updated in NPPES | Dec 19, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20A6027 | 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 | 317 |
|---|---|
| Services billed | 2,569 across 49 procedure codes |
| Paid by Medicare | $132,809 |
Part D prescriptions in 2024
| Prescriptions (claims) | 11,847 · 18,008 30-day fills |
|---|---|
| Patients | 389 |
| Total drug cost | $1,049,391 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of New England, College of Osteo Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Osteopathic Manipulative Medicine |
Hospital affiliations
- Adventist Health Howard MemorialWillits, CA
- Adventist Health Mendocino CoastFort Bragg, CA
- Adventist Health Ukiah ValleyUkiah, CA
- Sutter Lakeside HospitalLakeport, CA
Other facilities
- Adventist Health Home Care ServicesHome health agency · Willits, CA
- Silverline Staff Home HealthHome health agency · Fremont, CA
Industry payments (Open Payments)
- 2025$373.88 · 19 payments from 7 companies
- 2024$546.49 · 26 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $125.60 | 6 |
| Lilly USA, LLC | $106.60 | 5 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $52.04 | 3 |
| Novo Nordisk Inc | $34.59 | 2 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $21.52 | 1 |
What the 2025 payments were for
- Food and Beverage$373.88 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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