Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William Cihak, MD

Individual provider Internal Medicine Physician · NPI 1386643781

William Cihak, MD is an Internal Medicine in Olean, New York. Qualified in 1998, 28 years ago. Practices with Olean Medical Practice PLLC, a 57-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
28
Licensed in
NY
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

535 Main St
Olean, NY 14760-1513
Phone: (716) 372-0141
Fax: (716) 376-2273
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 216007 (NY)

Record details

NPI number1386643781
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 18, 2005
Last updated in NPPESFebruary 13, 2012
Mailing address535 Main St, Olean, NY 14760-1513

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice Olean Medical Practice Pllc — 57 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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