Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Leslie Glenn Biesecker, MD

Clinical Genetics (M.D.) Physician in Bethesda, MD · enumerated 2009.

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

National Provider Identifier

1871829648

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Registry record

Entity type Individual (Type 1)

Name Dr. Leslie Glenn Biesecker

Credential MD

Sex Male

Practice address 49 Convent Dr Rm 4a56, Bethesda, MD, 20892

Phone (301) 402-2041

Fax (301) 402-2170

Enumeration date Oct 28, 2009

Last updated in NPPES Oct 28, 2009

Taxonomy & licenses

207SG0201X Clinical Genetics (M.D.) Physician Allopathic & Osteopathic Physicians · License L1436933 (MI) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License L1436933 (MI) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

What is the NPI number for Leslie Biesecker?

The National Provider Identifier (NPI) for Leslie Biesecker is 1871829648, a Type 1 (individual) record in the CMS NPPES registry.

Where does Leslie Biesecker practice?

The practice location on file with NPPES is in Bethesda, MD. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-28.