Wahid Kassar, M.D.
NPI 1144203647ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Chicago, IL
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with Northshore Health Centers Inc and 1 other group, practicing in Chicago, Illinois. Their prescriptions cost Medicare Part D more than their services did: $3,067,909 for 4,339 claims, against $213,745 paid for services in 2024. Lilly USA, LLC was the largest of 24 companies reporting payments in 2025, $102,235 in all, mostly speaking and faculty fees. Lists Amita Health Resurrection Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1144203647 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 29, 2005 |
| Last updated in NPPES | Oct 2, 2025 |
| Certified by provider | Oct 2, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 036107989 | IL |
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 - Endocrinology (IL); Practitioner - Endocrinology (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 770 |
|---|---|
| Services billed | 3,395 across 18 procedure codes |
| Paid by Medicare | $213,745 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,339 · 9,770 30-day fills |
|---|---|
| Patients | 662 |
| Total drug cost | $3,067,909 |
| Generic share | 20% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Endocrinology |
Medical groups
- Northshore Health Centers IncLake Station, IN · 33 clinicians
- Wahid Kassar MD LtdChicago, IL · 2 clinicians
Hospital affiliations
- Amita Health Resurrection Medical CenterChicago, IL
- Community HospitalMunster, IN
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Saint Francis Hospital-EvanstonEvanston, IL
- Silver Cross Hospital and Medical CentersNew Lenox, IL
Industry payments (Open Payments)
- 2025$102,235 · 263 payments from 24 companies
- 2024$108,489 · 346 payments from 29 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $50,975 | 76 |
| Novo Nordisk Inc | $27,012 | 37 |
| Abbott Laboratories | $19,359 | 37 |
| Mannkind Corporation | $2,000 | 8 |
| Corcept Therapeutics | $475.06 | 20 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$71,928 · 55 payments
- Travel and Lodging$9,411 · 26 payments
- Compensation for serving as faculty or as a speaker for a medical education program$9,169 · 10 payments
- Consulting Fee$6,075 · 1 payment
- Food and Beverage$5,652 · 171 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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