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

Marissa Singer, MA, ATR

Art Therapist in Greenfield, MA · enumerated 2024.

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

National Provider Identifier

1821849126

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Registry record

Entity type Individual (Type 1)

Name Marissa Singer

Credential MA, ATR

Sex Female

Practice address Greenfield, MA, 01301

Phone (413) 359-8010

Enumeration date Mar 27, 2024

Last updated in NPPES Mar 27, 2024

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

Taxonomy & licenses

221700000X Art Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 21-021 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Marissa Singer?

The National Provider Identifier (NPI) for Marissa Singer is 1821849126, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marissa Singer practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-27.