Mark Klein, M.D.
NPI 1194776419 · Specialist · Washington, DC
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Klein, M.D. is a Specialist provider in Washington, DC (NPI 1194776419).
Provider details
- NPI number
- 1194776419
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD11986 (DC)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-12
- Last updated
- 2008-01-16
Frequently asked questions
- What is Mark Klein's NPI number?
- Mark Klein's National Provider Identifier (NPI) is 1194776419, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Klein's specialty?
- Mark Klein is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Mark Klein located?
- Mark Klein's practice location on file with NPPES is 2141 K St Nw, Washington, DC 20037-1810.
- What is Mark Klein's phone number?
- The practice phone number listed in the NPPES registry for Mark Klein is (202) 223-9722.
- Does Mark Klein accept Medicare?
- Mark Klein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Klein's NPI active?
- Yes — Mark Klein's NPI (1194776419) is active in the NPPES registry as of the last update on 2008-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.