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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

WARREN LEONARD MD
NPI 1952213498
Internal Medicine - Allergy & Immunology in Bethesda, MD

Active since September 21, 2026
9000 ROCKVILLE PIKE RM 7B05, BETHESDA, MD 20892(301) 496-0098 Get Directions Write a Review

NPPES record added: September 21, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Warren Leonard Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WARREN LEONARD MD (NPI 1952213498) is an individual allergy & immunology provider in Bethesda, Maryland, licensed in Maryland (D0027344) and active in the NPI registry since September 2026.

NPPES Registry Identity

NPI1952213498
Entity TypeIndividualMale
Primary Taxonomy207RA0201X
Provider Legal NameWARREN LEONARDCredential: MD
Location Address9000 ROCKVILLE PIKE RM 7B05Bethesda, MD 20892-1674
Mailing Address9020 Burdette RdBethesda, MD 20817-2114 · (202) 897-8962
Phone(301) 496-0098
Sole ProprietorNo
Enumeration DateSeptember 21, 2026
NPPES CertifiedSeptember 20, 2026
✔ NPI 1952213498 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Allergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207RA0201X
License✔ Licensed in MD · D0027344
Definition
An internist doctor of osteopathy that specializes in the treatment of allergy and immunologic disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Special Qualifications in the field of Allergy & Immunology.
9000 ROCKVILLE PIKE RM 7B05, Bethesda, MD 20892
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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Warren Leonard's NPI number?

The NPI number for Warren Leonard is 1952213498. It was assigned to this individual provider in the NPPES registry on September 21, 2026.

Where is Warren Leonard located?

Warren Leonard practices at 9000 Rockville Pike Rm 7b05, Bethesda, MD 20892. The listed phone number is (301) 496-0098.

What is Warren Leonard's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.

When was this NPI record last updated?

The NPPES record for Warren Leonard was last updated on September 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.