Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark Edgar Guillemette, COTA/L

Occupational Therapy Assistant in Somerset, MA · enumerated 2013.

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

National Provider Identifier

1528307634

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark Edgar Guillemette

Credential COTA/L

Sex Male

Practice address 626 Eastview Ave, Somerset, MA, 02726

Phone (508) 335-2495

Enumeration date Feb 8, 2013

Last updated in NPPES Feb 8, 2013

Taxonomy & licenses

224Z00000X Occupational Therapy Assistant Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 2991 (MA) Primary

224Z00000X Occupational Therapy Assistant Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License OTA00366 (RI) 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

How do I verify Mark Guillemette's NPI record?

Cross-check NPI 1528307634 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1528307634 active?

Yes, as of the latest NPPES snapshot, NPI 1528307634 is active (record last updated 2013-02-08).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-08.