Mark Janczewski, MD, MPH
NPI 1124022843 · Clinical Informatics Physician · Alexandria, VA
Mark Janczewski, MD, MPH is a Clinical Informatics Physician provider in Alexandria, VA (NPI 1124022843).
Provider details
- NPI number
- 1124022843
- Entity type
- Individual
- Primary specialty
- Clinical Informatics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101041106 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
21 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 410 Government Ave Ste 1Valparaiso, FL 32580-1061Phone: (703) 994-7637
Registry dates
- Enumerated
- 2005-06-09
- Last updated
- 2025-09-03
- Certified
- 2025-09-03
Frequently asked questions
- What is Mark Janczewski's NPI number?
- Mark Janczewski's National Provider Identifier (NPI) is 1124022843, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Janczewski's specialty?
- Mark Janczewski is listed in the NPPES registry with a primary specialty of Clinical Informatics Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Janczewski located?
- Mark Janczewski's practice location on file with NPPES is 425 S Payne St, Alexandria, VA 22314-5944.
- What is Mark Janczewski's phone number?
- The practice phone number listed in the NPPES registry for Mark Janczewski is (703) 994-7637.
- Is Mark Janczewski's NPI active?
- Yes — Mark Janczewski's NPI (1124022843) is active in the NPPES registry as of the last update on 2025-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.