Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Theodore Hamilton, LLP

Psychologist in Hastings, MI · enumerated 2006.

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

National Provider Identifier

1003845314

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Registry record

Entity type Individual (Type 1)

Name Mark Theodore Hamilton

Credential LLP

Sex Male

Practice address 450 Meadow Run Dr, Hastings, MI, 49058

Phone (616) 891-8770

Fax (616) 891-3504

Enumeration date Jun 30, 2006

Last updated in NPPES Mar 22, 2022

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 6301009792 (MI) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 6361004091 (MI) Primary

Other identifiers

Identifier	Type	State	Issuer
BC/BS	Other	MI	P10D11275

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.

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Frequently asked questions

What specialty is Mark Hamilton?

Mark Hamilton is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-03-22.