Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jennifer Leigh Rosenblum, MD

Adolescent Medicine (Internal Medicine) Physician in Waltham, MA · enumerated 2006.

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

National Provider Identifier

1316998107

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Registry record

Entity type Individual (Type 1)

Name Dr. Jennifer Leigh Rosenblum

Credential MD

Sex Female

Practice address 40 2nd Ave Ste 300, Mgh West, Waltham, MA, 02451

Phone (617) 643-1201

Fax (617) 243-6798

Enumeration date May 15, 2006

Last updated in NPPES Oct 30, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 209839 (MA) Secondary

207RA0000X Adolescent Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 209839 (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
0197629	Medicaid	MA	-
J25140	Other	MA	BCBS MA
209839	Other	MA	TUFTS HEALTH PLAN

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 Jennifer Rosenblum?

Jennifer Rosenblum is registered in NPPES with the primary taxonomy of Adolescent Medicine (Internal Medicine) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-10-30.