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

Mr. Dennis Milton Buck, M.S.

Q: What is the NPI number for Dennis Buck?

The National Provider Identifier (NPI) for Dennis Buck is 1891993135, a Type 1 (individual) record in the CMS NPPES registry.

Cognitive & Behavioral Psychologist in Mt Pleasant, MI · enumerated 2007.

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

National Provider Identifier

1891993135

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Registry record

Entity type Individual (Type 1)

Name Mr. Dennis Milton Buck

Credential M.S.

Sex Male

Practice address Mt Pleasant, MI, 48858

Phone (989) 773-1643

Enumeration date Jul 9, 2007

Last updated in NPPES Jul 9, 2007

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

Taxonomy & licenses

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 6301003974 (MI) Primary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 6801016813 (MI) Secondary

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 Dennis Buck practice?

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

What is the NPI number for Dennis Buck?

The National Provider Identifier (NPI) for Dennis Buck is 1891993135, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.