Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Melvyn H Defrin, MD

Retina Specialist (Ophthalmology) Physician in Worcester, MA · enumerated 2006.

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

National Provider Identifier

1679539217

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Registry record

Entity type Individual (Type 1)

Name Mr. Melvyn H Defrin

Credential MD

Sex Male

Practice address 67 Belmont Street, Suite 302, Worcester, MA, 01605

Phone (508) 752-1155

Fax (508) 752-4862

Enumeration date Apr 22, 2006

Last updated in NPPES Apr 12, 2017

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 46144 (MA) Secondary

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 46144 (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
110001169A	Medicaid	MA	-
N0188004	Other	MA	MEDICARE PTAN

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

Is NPI 1679539217 active?

Yes, as of the latest NPPES snapshot, NPI 1679539217 is active (record last updated 2017-04-12).

How do I verify Melvyn Defrin's NPI record?

Cross-check NPI 1679539217 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Brad Baker Retina Specialist (Ophthalmology) Physician · Worcester, MA NPI 1508853821 Frank Mccabe Retina Specialist (Ophthalmology) Physician · Worcester, MA NPI 1003870973

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-12.