Michael D. Williams, MD
NPI 1750334470ActiveIndividual· Internal Medicine, Gastroenterology· Columbia, MO
Internal Medicine, Gastroenterology (MD) in Columbia, Missouri, trained at University of Missouri, Columbia School of Medicine (class of 2003). In 2024 Medicare paid $548,725 for 719 patients, and Part D covered 964 of their prescriptions, 85% of them generic. Phathom Pharmaceuticals, Inc. was the largest of 18 companies reporting payments in 2025, $4,567 in all, mostly food and beverage.
Overview
| NPI | 1750334470 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 17, 2006 |
| Last updated in NPPES | Oct 6, 2022 |
| Certified by provider | Oct 6, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 2017008968 | MO |
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 - Gastroenterology (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 719 |
|---|---|
| Services billed | 23,136 across 61 procedure codes |
| Paid by Medicare | $548,725 |
Part D prescriptions in 2024
| Prescriptions (claims) | 964 · 1,295 30-day fills |
|---|---|
| Patients | 253 |
| Total drug cost | $361,064 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 2003 |
| Medicare specialty | Gastroenterology |
Medical group
- Gastrointestinal Associates, LLCColumbia, MO · 30 clinicians
Hospital affiliation
- Boone Hospital CenterColumbia, MO
Industry payments (Open Payments)
- 2025$4,567 · 138 payments from 18 companies
- 2024$40,124 · 189 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $1,892 | 7 |
| Abbvie Inc. | $744.64 | 36 |
| Janssen Biotech, Inc. | $360.49 | 19 |
| Takeda Pharmaceuticals U.S.A., Inc. | $272.80 | 15 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $246.47 | 13 |
What the 2025 payments were for
- Food and Beverage$2,801 · 135 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,720 · 1 payment
- Education$32.27 · 1 payment
- Travel and Lodging$14.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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