Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Joseph Clark, MD

Individual provider Psychiatry Physician · NPI 1538859269

John Joseph Clark, MD is a Psychiatry Physician in Washington, District of Columbia. Practices as a sole proprietor. Licensed in District of Columbia.

Licensed in
DC
In the registry since
2023
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2120 L St NW Ste 600
Washington, DC 20037-1540
Phone: (202) 741-2900
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence MD600004346 (DC)

Record details

NPI number1538859269
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 8, 2023
Last updated in NPPESJuly 1, 2025
Certification dateJuly 1, 2025
Mailing address2120 L St Nw Ste 600, Washington, DC 20037-1540

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