Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. John Francis O Brien, MD

Internal Medicine Physician in Newton Lower Falls, MA · enumerated 2006.

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

National Provider Identifier

1588678965

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Registry record

Entity type Individual (Type 1)

Name Mr. John Francis O Brien

Credential MD

Sex Male

Practice address 2000 Washington St, Suite 565, Newton Lower Falls, MA, 02462

Phone (617) 964-9050

Fax (617) 928-0913

Enumeration date Jul 28, 2006

Last updated in NPPES Oct 15, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 37318 (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
0405050	Other	MA	UNITED
P00091128	Other	-	RAILROAD MEDICARE
002308	Other	MA	ONE HEALTH
0743953001	Other	MA	CIGNA
0164879	Medicaid	MA	-
4037840	Other	MA	AETNA
037318	Other	MA	TUFTS
06224	Other	MA	HARVARD PILGRIM

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

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 O Brien?

John O Brien is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-15.