Michael L. Williams, D.O.
NPI 1851353247ActiveIndividual· Family Medicine· O'Fallon, MO
Opted out of Medicare from November 2022 to November 2026. Family Medicine (D.O.) in O'Fallon, Missouri, licensed in IL and CA, with an NPI issued in April 2006. Part D covered 450 prescriptions written in 2024, 90% of them generic. Astellas Pharma US Inc was the largest of 2 companies reporting payments in 2025, $35.63 in all, mostly food and beverage.
Overview
| NPI | 1851353247 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Apr 3, 2006 |
| Last updated in NPPES | Sep 23, 2022 |
| Certified by provider | Sep 20, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 2005036219 | IL |
| Family Medicine | 207Q00000X | 20A18065 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Nov 17, 2022 – Nov 17, 2026 |
| Can order and refer | Yes |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Part D prescriptions in 2024
| Prescriptions (claims) | 450 · 917 30-day fills |
|---|---|
| Patients | 49 |
| Total drug cost | $27,955 |
| Generic share | 90% of claims |
Industry payments (Open Payments)
- 2025$35.63 · 2 payments from 2 companies
- 2024$111.86 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $19.45 | 1 |
| Novo Nordisk Inc | $16.18 | 1 |
What the 2025 payments were for
- Food and Beverage$35.63 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Family Medicine providers in O'Fallon
- 1508359100
- 1861431983
- 1902916927