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

Dr. Bruce David Walker, MD

Infectious Disease Physician in Cambridge, MA · enumerated 2005.

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

National Provider Identifier

1770571572

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Registry record

Entity type Individual (Type 1)

Name Dr. Bruce David Walker

Credential MD

Sex Male

Practice address Cambridge, MA, 02139

Phone (857) 268-7072

Enumeration date Oct 6, 2005

Last updated in NPPES May 12, 2015

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

Taxonomy & licenses

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 49648 (MA) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 49648 (MA) Secondary

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
16279	Other	MA	PROVIDER CODE MGH
3350987-001	Other	MA	CIGNA PAL
049648	Other	MA	TUFTS
6191924	Medicaid	MA	-
4647796	Other	MA	AETNA
9204113	Other	MA	UNITED-PBO
J04403	Other	MA	BCBS
D82893075MGH	Other	MA	HPHC-PBO
D82893MGH	Other	MA	HPHC-ACD

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

What specialty is Bruce Walker?

Bruce Walker is registered in NPPES with the primary taxonomy of Infectious Disease Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

Other providers at this practice address

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Lloyd Klickstein Rheumatology Physician · Cambridge, MA NPI 1467423418

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-05-12.