Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Bruce Leff, M.D.

Geriatric Medicine (Internal Medicine) Physician in Baltimore, MD · enumerated 2006.

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

National Provider Identifier

1164466157

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Registry record

Entity type Individual (Type 1)

Name Bruce Leff

Credential M.D.

Sex Male

Practice address 5505 Hopkins Bayview Cir, Baltimore, MD, 21224

Phone (410) 550-0925

Enumeration date Jun 16, 2006

Last updated in NPPES Feb 11, 2013

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D37089 (MD) Secondary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License D37089 (MD) 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
286981100	Medicaid	MD	-

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 NPI 1164466157 active?

Yes, as of the latest NPPES snapshot, NPI 1164466157 is active (record last updated 2013-02-11).

How do I verify Bruce Leff's NPI record?

Cross-check NPI 1164466157 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-11.