Steven T. Zierer, M.D.
NPI 1366437337ActiveIndividual· Internal Medicine, Gastroenterology· Mesa, AZ
Internal Medicine, Gastroenterology (M.D.) in Mesa, Arizona, trained at Indiana University School of Medicine (class of 1989). Their prescriptions cost Medicare Part D more than their services did: $129,773 for 482 claims, against $22,652 paid for services in 2024. Ferring Pharmaceuticals Inc. was the largest of 11 companies reporting payments in 2024, $370.55 in all, mostly food and beverage.
Overview
| NPI | 1366437337 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 15, 2005 |
| Last updated in NPPES | Apr 28, 2025 |
| Certified by provider | Apr 28, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 20445 | AZ |
| Internal Medicine, Gastroenterology | 207RG0100X | 141413 | MT |
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 (AZ); Practitioner - Gastroenterology (MT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 166 |
|---|---|
| Services billed | 248 across 32 procedure codes |
| Paid by Medicare | $22,652 |
Part D prescriptions in 2024
| Prescriptions (claims) | 482 · 1,040 30-day fills |
|---|---|
| Patients | 191 |
| Total drug cost | $129,773 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Indiana University School of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Gastroenterology |
Medical group
- Kalispell Regional Medical Center IncKalispell, MT · 421 clinicians
Hospital affiliation
- Logan Health Medical CenterKalispell, MT
Industry payments (Open Payments)
- 2024$370.55 · 19 payments from 11 companies
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Ferring Pharmaceuticals Inc. | $80.24 | 3 |
| Gilead Sciences, Inc. | $55.28 | 3 |
| Regeneron Healthcare Solutions, Inc. | $45.91 | 2 |
| Abbvie Inc. | $39.41 | 2 |
| Ironwood Pharmaceuticals, Inc | $36.89 | 2 |
What the 2024 payments were for
- Food and Beverage$370.55 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 53 gastroenterologists in Mesa · All gastroenterologists in Arizona