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

Dr. Irving Louis Weissman, M.D.

Ophthalmology Physician in Brighton, MA · enumerated 2006.

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

National Provider Identifier

1003866351

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Registry record

Entity type Individual (Type 1)

Name Dr. Irving Louis Weissman

Credential M.D.

Sex Male

Practice address Brighton, MA, 02135

Phone (617) 787-5503

Fax (617) 787-1140

Enumeration date May 10, 2006

Last updated in NPPES Jun 28, 2010

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

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 30368 (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
0023268	Other	-	NHP
0096167	Other	-	AETNA
0198862	Medicaid	MA	-
15275	Other	-	HARVARD PILGRAM NUMBER
030368	Other	-	TUFTS HEALTH PLAN
30368	Other	MA	MEDICAL LICENSE NUMBER
08-00059	Other	-	UNITED HEALTH CARE
4832	Other	-	TARGET
8194	Other	-	DAVIS
96167	Other	-	U.S. HEALTH CARE

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 Irving Weissman practice?

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

What is the NPI number for Irving Weissman?

The National Provider Identifier (NPI) for Irving Weissman is 1003866351, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-28.