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

Thomas Grisso

Forensic Psychologist in Shrewsbury, MA · enumerated 2018.

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

National Provider Identifier

1801385489

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Registry record

Entity type Individual (Type 1)

Name Thomas Grisso

Sex Male

Practice address Shrewsbury, MA, 01545

Phone (508) 852-3950

Enumeration date May 9, 2018

Last updated in NPPES May 9, 2018

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

Taxonomy & licenses

103TF0200X Forensic Psychologist Behavioral Health & Social Service Providers · License 4276 (MA) Primary

103TF0200X Forensic Psychologist Behavioral Health & Social Service Providers · License 4278 (MA) 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 Thomas Grisso practice?

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

What is the NPI number for Thomas Grisso?

The National Provider Identifier (NPI) for Thomas Grisso is 1801385489, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-05-09.