Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew S Horsfield, MD

Family Medicine Physician in Worcester, MA · enumerated 2005.

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

National Provider Identifier

1013998129

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Registry record

Entity type Individual (Type 1)

Name Matthew S Horsfield

Credential MD

Sex Male

Practice address 5 Neponset St, Worcester, MA, 01606

Phone (508) 425-5566

Fax (508) 365-6590

Enumeration date Nov 7, 2005

Last updated in NPPES May 20, 2024

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 1015693 (MA) Primary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 18082 (SC) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 12242R (LA) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License M5232 (TX) Secondary

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

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 Horsfield practice?

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

What is the NPI number for Matthew Horsfield?

The National Provider Identifier (NPI) for Matthew Horsfield is 1013998129, 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 2024-05-20.