Ammar Hassan, D.O.
NPI 1023428877ActiveIndividual· Internal Medicine, Gastroenterology· Munster, IN
Internal Medicine, Gastroenterology (D.O.) in Munster, Indiana, trained at Midwestern University, Chicago College of Osteopathic Med (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $651,910 for 1,476 claims, against $123,918 paid for services in 2024. Takeda Pharmaceuticals U.S.A., Inc. was the largest of 13 companies reporting payments in 2025, $1,082 in all, mostly food and beverage.
Overview
| NPI | 1023428877 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | May 2, 2014 |
| Last updated in NPPES | Dec 15, 2025 |
| Certified by provider | Dec 15, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 2005989A | IN |
| Internal Medicine | 207R00000X | 02005989A | IN |
| Internal Medicine | 207R00000X | 036153911 | IL |
| Internal Medicine, Gastroenterology | 207RG0100X | 036153911 | 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 (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 713 |
|---|---|
| Services billed | 1,463 across 60 procedure codes |
| Paid by Medicare | $123,918 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,476 · 2,353 30-day fills |
|---|---|
| Patients | 761 |
| Total drug cost | $651,910 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | Midwestern University, Chicago College of Osteopathic Med |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Prime Healthcare Illinois Medical Group LLCChicago, IL · 322 clinicians
- Dalal Medical CorporationMunster, IN · 9 clinicians
Hospital affiliations
- Franciscan Health DyerDyer, IN
- Franciscan Health MunsterMunster, IN
- Methodist Hospitals IncGary, IN
- Presence Mercy Medical CenterAurora, IL
- Saint Joseph Medical CenterJoliet, IL
Industry payments (Open Payments)
- 2025$1,082 · 49 payments from 13 companies
- 2024$897.23 · 45 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc. | $411.18 | 17 |
| Abbvie Inc. | $247.61 | 12 |
| Ardelyx, Inc. | $92.14 | 4 |
| Madrigal Pharmaceuticals | $79.59 | 2 |
| Janssen Biotech, Inc. | $39.36 | 2 |
What the 2025 payments were for
- Food and Beverage$1,082 · 49 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Gastroenterology providers in Indiana →