Mark Klein, M.D.
Specialist · Washington, DC
Mark Klein, M.D. is a specialist with a practice address in Washington, District of Columbia, and NPI 1194776419, issued on May 12, 2006. Check the license (District of Columbia MD11986, as entered in NPPES) with the District of Columbia board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Klein
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- MD11986 DC
Self-reported in NPPES; status is on the state search - Practice location
- 2141 K St NW, Washington, DC 20037
- Phone
- (202) 223-9722
- Enumerated
- May 12, 2006
- Record last updated
- Jan 16, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (703) 280-5098
- Entity
- Type 1 · individual
8 nearest specialist records → All 151 in District of Columbia → Look up another NPI →
Also registered at 2141 K St NW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ramin Abrahim, M.D.Specialist1689623209
- Elliot Aleskow, MDInternal Medicine Physician1154334340
- Linda Assatourians, M.D.Internal Medicine Physician1891881306
- Philip Assatourians, M.D.Gastroenterology Physician1104912617
- Gwen Barch, ANPAdult Health Nurse Practitioner1942320734
- Anthony Barone, M.D.Specialist1780632166
Verify Mark Klein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich District of Columbia board licenses this profession
Search for license MD11986Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Klein among 151 specialist records in District of Columbia
Mark Klein, M.D. is one of 151 specialist records with a practice address in District of Columbia. 23% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 58% newer
- In a Medicare fileNo · 23% of these records are
- In the CMS Doctors and Clinicians fileNo · 9% of these records are
- Record last updated2008 · 82% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in District of Columbia
There are 151 specialist records in District of Columbia. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 151 in District of Columbia → Every provider in Washington → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Rafat Abbasi, M.D.Washington, DC 200371114004496
- Ramin Abrahim, M.D.Washington, DC 200371689623209
- Anthony Barone, M.D.Washington, DC 200371780632166
- Maurice Butler, M.D.Washington, DC 200371619054384
- Rajiv Chopra, MDWashington, DC 200371851349617
- Edward Lipsit, M.D.Washington, DC 200371316997620
- Daniel Marder, M.D.Washington, DC 200371780635615
- Judith Maslar, M.D.Washington, DC 200371033169719
Common questions
What is Mark Klein, M.D.'s NPI number?
Mark Klein, M.D.'s National Provider Identifier (NPI) is 1194776419, issued on May 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Klein, M.D. located?
The NPPES record lists a practice address at 2141 K St NW, Washington, DC, 20037. Phone: (202) 223-9722. Providers update this record themselves, so call before visiting.
How can I verify Mark Klein, M.D.'s license?
NPPES lists District of Columbia license number MD11986, as entered by the provider. Search the District of Columbia board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.