Zafar Quader, M.D.
NPI 1124013636ActiveIndividual· Internal Medicine, Gastroenterology· Springfield, IL
Internal Medicine, Gastroenterology (M.D.) with Siu Physicians and Surgeons Inc, practicing in Springfield, Illinois. Their prescriptions cost Medicare Part D more than their services did: $179,475 for 542 claims, against $49,020 paid for services in 2024. Janssen Biotech, Inc. was the largest of 4 companies reporting payments in 2025, $473.82 in all, mostly food and beverage. Lists Memorial Medical Center as a hospital affiliation.
Overview
| NPI | 1124013636 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 12, 2005 |
| Last updated in NPPES | Sep 29, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 036-082132 | IL |
| Internal Medicine, Gastroenterology | 207RG0100X | 109425 | 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 (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 240 |
|---|---|
| Services billed | 451 across 33 procedure codes |
| Paid by Medicare | $49,020 |
Part D prescriptions in 2024
| Prescriptions (claims) | 542 · 891 30-day fills |
|---|---|
| Patients | 182 |
| Total drug cost | $179,475 |
| Generic share | 76% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Siu Physicians and Surgeons IncSpringfield, IL · 314 clinicians
Hospital affiliation
- Memorial Medical CenterSpringfield, IL
Industry payments (Open Payments)
- 2025$473.82 · 7 payments from 4 companies
- 2024$17.11 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $151.64 | 4 |
| Madrigal Pharmaceuticals | $149.00 | 1 |
| Terumo Medical Corporation | $136.83 | 1 |
| Abbvie Inc. | $36.35 | 1 |
What the 2025 payments were for
- Food and Beverage$473.82 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 25 gastroenterologists in Springfield · All gastroenterologists in Illinois