William Cihak, MD
NPI 1386643781ActiveIndividual· Internal Medicine· Olean, NY
Internal Medicine (MD) with Olean Medical Practice PLLC, practicing in Olean, New York. Their prescriptions cost Medicare Part D more than their services did: $1,494,965 for 19,939 claims, against $140,151 paid for services in 2024. Novo Nordisk Inc was the largest of 13 companies reporting payments in 2025, $454.29 in all, mostly food and beverage. Lists Kaleida Health and 1 other hospital as hospital affiliations.
Overview
| NPI | 1386643781 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 18, 2005 |
| Last updated in NPPES | Feb 13, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 216007 | NY |
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 - Internal Medicine (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 957 |
|---|---|
| Services billed | 5,063 across 125 procedure codes |
| Paid by Medicare | $140,151 |
Part D prescriptions in 2024
| Prescriptions (claims) | 19,939 · 40,875 30-day fills |
|---|---|
| Patients | 1,174 |
| Total drug cost | $1,494,965 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Olean Medical Practice PLLCOlean, NY · 51 clinicians
Hospital affiliations
- Kaleida HealthBuffalo, NY
- Olean General HospitalOlean, NY
Other facilities
- Cattaraugus County Department of Health ChhaHome health agency · Olean, NY
- Vna of Western Ny ChhaHome health agency · Cheektowaga, NY
- Homecare & HospiceHospice · Allegany, NY
Industry payments (Open Payments)
- 2025$454.29 · 25 payments from 13 companies
- 2024$515.16 · 27 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $97.67 | 5 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $80.86 | 4 |
| Lilly USA, LLC | $56.50 | 3 |
| Pfizer Inc. | $46.91 | 3 |
| Glaxosmithkline, LLC. | $27.24 | 2 |
What the 2025 payments were for
- Food and Beverage$454.29 · 25 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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