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

Gregory Dean Zimmerman, M.S.W., L.I.C.S.W.

Clinical Social Worker in South Deerfield, MA · enumerated 2007 · practices at Collective Home Care, Inc..

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

National Provider Identifier

1609914159

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Registry record

Entity type Individual (Type 1)
Name Gregory Dean Zimmerman
Credential M.S.W., L.I.C.S.W.
Sex Male
Practice address South Deerfield, MA, 01373
Phone (413) 665-3663
Enumeration date Feb 4, 2007
Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1019458 (MA) 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 Gregory Zimmerman practice?
The practice location on file with NPPES is in South Deerfield, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gregory Zimmerman?
The National Provider Identifier (NPI) for Gregory Zimmerman is 1609914159, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.