Jonathan F. Williams, D.0.
NPI 1013195650ActiveIndividual· Internal Medicine, Gastroenterology· Kenilworth, IL
Internal Medicine, Gastroenterology (D.0.) with Mercy Health System Corporation and 1 other group, practicing in Kenilworth, Illinois. In 2024 Medicare paid $269,949 for 980 patients, and Part D covered 1,380 of their prescriptions, 85% of them generic. Celltrion USA Inc. reported $124.06 in payments in 2025, mostly food and beverage. Lists Mercy Health System Corp and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1013195650 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.0. |
| Sole proprietor | No |
| NPI issued | Feb 6, 2008 |
| Last updated in NPPES | May 31, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 036-111829 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (IL); Practitioner - Gastroenterology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 980 |
|---|---|
| Services billed | 3,807 across 32 procedure codes |
| Paid by Medicare | $269,949 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,380 · 2,858 30-day fills |
|---|---|
| Patients | 393 |
| Total drug cost | $208,232 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2002 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Mercy Health System CorporationJanesville, WI · 753 clinicians
- Gastroenterology Consultants of the North ShoreGlenview, IL · 2 clinicians
Hospital affiliations
- Mercy Health System CorpJanesville, WI
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Swedish HospitalChicago, IL
Industry payments (Open Payments)
- 2025$124.06 · 1 payment from 1 company
- 2024$163.62 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Celltrion USA Inc. | $124.06 | 1 |
What the 2025 payments were for
- Food and Beverage$124.06 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Kenilworth
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- 1326030511
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