Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William C Collyer, M.D.

Urology Physician in Evansville, IN · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1225096621

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Registry record

Entity type Individual (Type 1)

Name William C Collyer

Credential M.D.

Sex Male

Practice address 421 Chestnut St, Evansville, IN, 47713

Phone (812) 426-9855

Fax (812) 858-4536

Enumeration date May 3, 2006

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 2005019860 (MO) Secondary

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 01078796A (IN) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Collyer practice?

The practice location on file with NPPES is in Evansville, IN. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Collyer?

The National Provider Identifier (NPI) for William Collyer is 1225096621, a Type 1 (individual) record in the CMS NPPES registry.

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Mary Tadros Endocrinology, Diabetes & Metabolism Physician · Evansville, IN NPI 1164425591 Jane Lim MOHS-Micrographic Surgery Physician · Evansville, IN NPI 1699778050 Richard Bell Rheumatology Physician · Evansville, IN NPI 1962497552 Gordon Green Optometrist · Evansville, IN NPI 1063401107 Shaukat Iftikhar Gastroenterology Physician · Evansville, IN NPI 1184606022 Beth Petersen Clinical Psychologist · Evansville, IN NPI 1518941384 Melissa Fuquay Nurse Practitioner · Evansville, IN NPI 1952385791 Robert Martin Dermatology Physician · Evansville, IN NPI 1215906516

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-03-17.