Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Theodore James Chapin, PH.D.

Marriage & Family Therapist in Peoria, IL · enumerated 2006.

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

National Provider Identifier

1255393039

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Registry record

Entity type Individual (Type 1)

Name Theodore James Chapin

Credential PH.D.

Sex Male

Practice address 4940 N Weaverridge Blvd, Peoria, IL, 61615

Phone (309) 689-0681

Enumeration date Apr 5, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers Primary

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

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

What is the NPI number for Theodore Chapin?

The National Provider Identifier (NPI) for Theodore Chapin is 1255393039, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.