Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew Jonathan Spitzer, MD

Endocrinology, Diabetes & Metabolism Physician in Greenfield, MA · enumerated 2008.

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

National Provider Identifier

1770743999

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Registry record

Entity type Individual (Type 1)

Name Matthew Jonathan Spitzer

Credential MD

Sex Male

Practice address 329 Conway St, Greenfield, MA, 01301

Phone (413) 774-6301

Fax (866) 644-0871

Enumeration date Jun 11, 2008

Last updated in NPPES Mar 27, 2024

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 249715 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
110096042A	Medicaid	MA	-
57529	Other	MA	HEALTH NEW ENGLAND

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 Matthew Spitzer practice?

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

What is the NPI number for Matthew Spitzer?

The National Provider Identifier (NPI) for Matthew Spitzer is 1770743999, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Mark Allen Family Medicine Physician · Greenfield, MA NPI 1285633198 Paul Carlan Internal Medicine Physician · Greenfield, MA NPI 1770582603 Marguerite Gump Family Medicine Physician · Greenfield, MA NPI 1982604328 Jeffrey Palmer Family Medicine Physician · Greenfield, MA NPI 1255331336 Richard Brown Rheumatology Physician · Greenfield, MA NPI 1689657231 Georgia Weeber Podiatrist · Greenfield, MA NPI 1447220645 Patricia Iverson Family Medicine Physician · Greenfield, MA NPI 1063484038 Jessica Biggie Family Medicine Physician · Greenfield, MA NPI 1689649584

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