John Clark, MD
NPI 1538859269 · Psychiatry Physician · Washington, DC
John Clark, MD is a Psychiatry Physician provider in Washington, DC (NPI 1538859269).
Provider details
- NPI number
- 1538859269
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD600004346 (DC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Amitriptyline Hcl | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-05-08
- Last updated
- 2025-07-01
- Certified
- 2025-07-01
Frequently asked questions
- What is John Clark's NPI number?
- John Clark's National Provider Identifier (NPI) is 1538859269, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Clark's specialty?
- John Clark is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Clark located?
- John Clark's practice location on file with NPPES is 2120 L St Nw Ste 600, Washington, DC 20037-1540.
- What is John Clark's phone number?
- The practice phone number listed in the NPPES registry for John Clark is (202) 741-2900.
- Is John Clark's NPI active?
- Yes — John Clark's NPI (1538859269) is active in the NPPES registry as of the last update on 2025-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.