Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John T Larossa, M.D.

Specialist in Newton, MA · enumerated 2006.

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

National Provider Identifier

1346217155

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. John T Larossa

Credential M.D.

Sex Male

Practice address 2000 Washington St, Suite 100, Newton, MA, 02462

Phone (617) 244-1311

Fax (617) 244-2819

Enumeration date Mar 1, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 36773 (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
2051524	Medicaid	MA	-
B33459	Other	MA	BC/BS
60453	Other	MA	PILGRIM
701905	Other	MA	TUFTS
3300175	Other	MA	UNITED
B10018001	Other	MA	CIGNA

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 this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is John Larossa?

John Larossa is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

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