James Ralph Clark, M.D.
NPI 1588640650ActiveIndividual· Internal Medicine, Gastroenterology· Downers Grove, IL
Internal Medicine, Gastroenterology (M.D.) in Downers Grove, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $555,470 for 889 claims, against $94,844 paid for services in 2024. Abbvie Inc. was the largest of 15 companies reporting payments in 2025, $1,160 in all, mostly food and beverage.
Overview
| NPI | 1588640650 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 20, 2005 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | — | 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 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) | Enrolled Practitioner - Gastroenterology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 399 |
|---|---|
| Services billed | 953 across 28 procedure codes |
| Paid by Medicare | $94,844 |
Part D prescriptions in 2024
| Prescriptions (claims) | 889 · 1,777 30-day fills |
|---|---|
| Patients | 376 |
| Total drug cost | $555,470 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Gi Partners of Illinois PLLCLibertyville, IL · 39 clinicians
Hospital affiliation
- Advocate Good Samaritan HospitalDowners Grove, IL
Industry payments (Open Payments)
- 2025$1,160 · 56 payments from 15 companies
- 2024$1,316 · 65 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $308.57 | 20 |
| Takeda Pharmaceuticals U.S.A., Inc. | $285.95 | 14 |
| Genzyme Corporation | $111.30 | 4 |
| Gilead Sciences, Inc. | $99.87 | 5 |
| Phathom Pharmaceuticals, Inc. | $96.66 | 2 |
What the 2025 payments were for
- Food and Beverage$1,160 · 56 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Downers Grove
- 1760534663
- 1205966678
- 1841276417
- 1942312210
- 1356341846
- 1306958665
- 1356327910
All Internal Medicine, Gastroenterology providers in Illinois →