William Lee Hasler, MD
NPI 1346322872ActiveIndividual· Internal Medicine, Gastroenterology· Ann Arbor, MI
Internal Medicine, Gastroenterology (MD) with Mayo Clinic Arizona, practicing in Ann Arbor, Michigan. Their prescriptions cost Medicare Part D more than their services did: $104,188 for 441 claims, against $56,220 paid for services in 2024. Enterra Medical, Inc. was the largest of 3 companies reporting payments in 2025, $1,461 in all, mostly food and beverage. Lists Mayo Clinic Hospital as a hospital affiliation.
Overview
| NPI | 1346322872 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 20, 2006 |
| Last updated in NPPES | Oct 18, 2021 |
| Certified by provider | Oct 18, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 64800 | AZ |
| Internal Medicine | 207R00000X | 4301404025 | MI |
| Internal Medicine, Gastroenterology | 207RG0100X | 4301404025 | MI |
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) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 456 |
|---|---|
| Services billed | 701 across 33 procedure codes |
| Paid by Medicare | $56,220 |
Part D prescriptions in 2024
| Prescriptions (claims) | 441 · 624 30-day fills |
|---|---|
| Patients | 97 |
| Total drug cost | $104,188 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 1983 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Mayo Clinic ArizonaScottsdale, AZ · 1,626 clinicians
Hospital affiliation
- Mayo Clinic HospitalPhoenix, AZ
Industry payments (Open Payments)
- 2025$1,461 · 8 payments from 3 companies
- 2024$179.20 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Enterra Medical, Inc. | $1,280 | 6 |
| Cumberland Pharmaceuticals, Inc. | $98.52 | 1 |
| Atmo Biosciences Inc | $82.62 | 1 |
What the 2025 payments were for
- Food and Beverage$1,061 · 7 payments
- Consulting Fee$400.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 96 gastroenterologists in Ann Arbor · All gastroenterologists in Michigan