Gretchen Kathleen Williams, D.O
NPI 1659663581ActiveIndividual· Surgery· Kankakee, IL
Surgery (D.O) in Kankakee, Illinois, trained at At Still University of Health Sciences, College of Osteo Med, Kirksville (class of 2011). 252 Medicare patients in 2024, $79,709 paid; nearly all of their 75 Part D prescriptions were generic (97%). Merck Sharp & Dohme LLC was the largest of 2 companies reporting payments in 2025, $39.44 in all, mostly food and beverage.
Overview
| NPI | 1659663581 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O |
| Sole proprietor | Yes |
| NPI issued | May 11, 2011 |
| Last updated in NPPES | Feb 9, 2021 |
| Certified by provider | Feb 9, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 5101019120 | MI |
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 - General Surgery (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 252 |
|---|---|
| Services billed | 536 across 72 procedure codes |
| Paid by Medicare | $79,709 |
Part D prescriptions in 2024
| Prescriptions (claims) | 75 · 81 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $947.87 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | At Still University of Health Sciences, College of Osteo Med, Kirksville |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | General Surgery |
Medical group
- Riverside Health SystemWillmington, IL · 199 clinicians
Hospital affiliation
- Riverside Medical CenterKankakee, IL
Industry payments (Open Payments)
- 2025$39.44 · 2 payments from 2 companies
- 2024$1,560 · 5 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $24.41 | 1 |
| Intuitive Surgical, Inc. | $15.03 | 1 |
What the 2025 payments were for
- Food and Beverage$39.44 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 general surgeons in Kankakee · All general surgeons in Illinois