Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. William A Hilgendorf, PHD

Clinical Psychologist in Carmel, IN · enumerated 2005.

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

National Provider Identifier

1265439921

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William A Hilgendorf

Credential PHD

Sex Male

Practice address Carmel, IN, 46032

Phone (317) 688-2647

Fax (317) 688-2921

Enumeration date Jul 7, 2005

Last updated in NPPES Oct 19, 2021

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 20040359A (IN) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 20040359A (IN) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
100337310B	Medicaid	IN	-
P00831908	Other	IN	RAILROAD MEDICARE
100337310	Medicaid	IN	-

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 Hilgendorf practice?

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

What is the NPI number for William Hilgendorf?

The National Provider Identifier (NPI) for William Hilgendorf is 1265439921, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-10-19.