Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Marc Hamilton

Optometrist in Gray, ME · enumerated 2020 · practices at Gray Physical Therapy Center, PA.

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

National Provider Identifier

1154949345

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Registry record

Entity type Individual (Type 1)

Name John Marc Hamilton

Sex Male

Practice address 6 Turnpike Acres Rd, Gray, ME, 04039

Phone (207) 657-4488

Enumeration date Jul 14, 2020

Last updated in NPPES Dec 14, 2022

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OPT1031 (ME) Primary

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

Where does John Marc Hamilton practice?

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

What is the NPI number for John Marc Hamilton?

The National Provider Identifier (NPI) for John Marc Hamilton is 1154949345, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Leo Credit Physical Therapist · Gray, ME NPI 1477509115 Gray Physical Therapy Center, PA Physical Therapist · Gray, ME NPI 1861449811 Mary Feltovic Physical Therapist · Gray, ME NPI 1932149085 David Guiseley Optometrist · Gray, ME NPI 1558378737

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-14.