Mariam A. Khan, MD
NPI 1225317464ActiveIndividual· Internal Medicine, Rheumatology· Elmhurst, IL
Internal Medicine, Rheumatology (MD) with Endeavor Health Medical Group, practicing in Elmhurst, Illinois. Their prescriptions cost Medicare Part D more than their services did: $2,543,132 for 2,630 claims, against $409,817 paid for services in 2024. Abbvie Inc. was the largest of 4 companies reporting payments in 2025, $315.44 in all, mostly food and beverage. Lists Edward Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1225317464 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 5, 2011 |
| Last updated in NPPES | Jun 14, 2021 |
| Certified by provider | Jun 14, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 036146687 | 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 - Rheumatology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 363 |
|---|---|
| Services billed | 72,362 across 24 procedure codes |
| Paid by Medicare | $409,817 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,630 · 5,731 30-day fills |
|---|---|
| Patients | 538 |
| Total drug cost | $2,543,132 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Rheumatology |
| Telehealth | Offers telehealth |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Edward HospitalNaperville, IL
- Elmhurst Memorial HospitalElmhurst, IL
- Uchicago Medicine Adventhealth HinsdaleHinsdale, IL
Industry payments (Open Payments)
- 2025$315.44 · 9 payments from 4 companies
- 2024$137.73 · 6 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $173.41 | 5 |
| Ucb, Inc. | $79.97 | 2 |
| Lilly USA, LLC | $33.00 | 1 |
| E.R. Squibb & Sons, L.L.C. | $29.06 | 1 |
What the 2025 payments were for
- Food and Beverage$315.44 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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