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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. HADLEY MADISON DIEP MD
NPI 1356138663
General Practice in Bethesda, MD

Active since April 21, 2025
8901 WISCONSIN AVE, BETHESDA, MD 20889(301) 295-4000 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Hadley Madison Diep Md NPPES

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

DR. HADLEY MADISON DIEP MD (NPI 1356138663) is an individual general practice provider in Bethesda, Maryland, licensed in Virginia (0116041572) and active in the NPI registry since April 2025.

NPPES Registry Identity

NPI1356138663
Entity TypeIndividualFemale
Primary Taxonomy208D00000X
Provider Legal NameDR. HADLEY MADISON DIEPCredential: MD
Location Address8901 WISCONSIN AVEBethesda, MD 20889-0001
Mailing Address8901 Wisconsin AveBethesda, MD 20889-0001
Phone(301) 295-4000
Sole ProprietorNo
Enumeration DateApril 21, 2025
Last NPPES UpdateJuly 13, 2026
NPPES CertifiedJuly 13, 2026
✔ NPI 1356138663 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyGeneral PracticeAllopathic & Osteopathic Physicians
Taxonomy Code208D00000X
License✔ Licensed in VA · 0116041572
Definition
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. Source: National Uniform Claim Committee
8901 WISCONSIN AVE, Bethesda, MD 20889
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. TAMMERA NELSON
Pharmacist
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-4497
DAWOOD TAFTI M.D.
Radiology (Diagnostic Radiology)
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 319-8373
DR. ASHLEY BEE BOZZAY
Student in an Organized Health Care Education/Training Program
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-8588
DR. ADAM JOSEPH MAIER DO
Internal Medicine (Infectious Disease)
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-4000
OANA MARIA POVIAN STROIE MD
General Practice
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-4000
SIMAL RUHISHTA ALI DO
General Practice
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-4900
DR. JACOB L FRIESEN M.D.
Psychiatry & Neurology (Psychiatry)
8901 WISCONSIN AVE, WRNMMC, NICOE, BUILDING 51
BETHESDA, MD 20889
Montgomery County (301) 319-3772
MS. CARLA PATRICE ALEXIS P.T.
Physical Therapist
8901 WISCONSIN AVE
BETHESDA, MD 20889
Montgomery County (301) 295-4880

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 Hadley Diep's NPI number?

The NPI number for Hadley Diep is 1356138663. It was assigned to this individual provider in the NPPES registry on April 21, 2025.

Where is Hadley Diep located?

Hadley Diep practices at 8901 Wisconsin Ave, Bethesda, MD 20889. The listed phone number is (301) 295-4000.

What is Hadley Diep's specialty?

The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.

When was this NPI record last updated?

The NPPES record for Hadley Diep was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 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.