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JOHN JOSEPH CLARK MD
NPI 1538859269
Psychiatry & Neurology - Psychiatry in Washington, DC

Active since May 08, 2023
2120 L ST NW STE 600, WASHINGTON, DC 20037(202) 741-2900 Get Directions Write a Review

NPPES record last updated: July 1, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 1, 2025, May 8, 2023 (2 updates tracked since 2023).

About John Joseph Clark Md NPPES

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

JOHN JOSEPH CLARK MD (NPI 1538859269) is an individual psychiatry provider in Washington, District Of Columbia, licensed in District Of Columbia (MD600004346) and active in the NPI registry since May 2023.

NPPES Registry Identity

NPI1538859269
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameJOHN JOSEPH CLARKCredential: MD
Location Address2120 L ST NW STE 600Washington, DC 20037-1540
Mailing Address2120 L St Nw Ste 600Washington, DC 20037-1540 · (202) 741-2900
Phone(202) 741-2900
Sole ProprietorYes
Enumeration DateMay 8, 2023
Last NPPES UpdateJuly 1, 20252 updates tracked since enumeration
NPPES CertifiedJuly 1, 2025
✔ NPI 1538859269 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in DC · MD600004346
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
2120 L ST NW STE 600, Washington, DC 20037
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Other Providers at the Same Location NPPES 13

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

STEPHANIE KIELB PHD
Psychologist
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (202) 741-2888
DR. BRANDON KOHRT M.D., PH.D.
Psychiatry & Neurology (Psychiatry)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (404) 895-1643
JAMES W LOCKHART MD
Psychiatry & Neurology (Psychiatry)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (202) 202-7412
YUMIN KIM MD
Student in an Organized Health Care Education/Training Program
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (202) 741-3000
ANNA R WEISSMAN MD
Psychiatry & Neurology (Psychiatry)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (202) 741-2900
NINA KAHYOH GOVALLA MD
Psychiatry & Neurology (Psychiatry)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (202) 741-2888
MARGARET GLORIA HILDER VALVERDE M.D.
Psychiatry & Neurology (Psychiatry)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (904) 707-2039
DR. COURTNEY NICOLE FORBES PHD
Psychologist (Clinical)
2120 L ST NW STE 600
WASHINGTON, DC 20037
District of Columbia (304) 767-0093

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 John Clark's NPI number?

The NPI number for John Clark is 1538859269. It was assigned to this individual provider in the NPPES registry on May 8, 2023.

Where is John Clark located?

John Clark practices at 2120 L St NW Ste 600, Washington, DC 20037. The listed phone number is (202) 741-2900.

What is John Clark's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

When was this NPI record last updated?

The NPPES record for John Clark was last updated on July 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.