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DR. MARK GEORGE JANCZEWSKI MD, MPH
NPI 1124022843
Preventive Medicine - Clinical Informatics in Alexandria, VA

Active since June 09, 2005
425 S PAYNE ST, ALEXANDRIA, VA 22314(703) 994-7637 Get Directions Write a Review

NPPES record last updated: September 3, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Mark George Janczewski Md, Mph NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK GEORGE JANCZEWSKI MD, MPH (NPI 1124022843) is an individual clinical informatics provider in Alexandria, Virginia, licensed in Virginia (0101041106) and active in the NPI registry since June 2005. He maintains a secondary practice location in Valparaiso.

NPPES Registry Identity

NPI1124022843
Entity TypeIndividualMale
Primary Taxonomy2083C0008X
Provider Legal NameDR. MARK GEORGE JANCZEWSKICredential: MD, MPH
Location Address425 S PAYNE STAlexandria, VA 22314-5944
Mailing Address425 S Payne StAlexandria, VA 22314-5944 · (703) 994-7637
Phone(703) 994-7637
Sole ProprietorYes
Enumeration DateJune 9, 2005
Last NPPES UpdateSeptember 3, 2025
NPPES CertifiedSeptember 3, 2025
✔ NPI 1124022843 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyPreventive Medicine · Clinical InformaticsAllopathic & Osteopathic Physicians
Taxonomy Code2083C0008X
License✔ Licensed in VA · 0101041106
Definition
Physicians who practice Clinical Informatics collaborate with other health care and information technology professionals to analyze, design, implement and evaluate information and communication systems that enhance individual and population health outcomes, improve patient care, and strengthen the clinician-patient relationship. Clinical Informaticians use their knowledge of patient care combined with their understanding of informatics concepts, methods, and tools to: assess information and knowledge needs of health care professionals and patients; characterize, evaluate, and refine clinical processes; develop, implement, and refine clinical decision support systems; and lead or participate in the procurement, customization, development, implementation, management, evaluation, and continuous improvement of clinical information systems.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 0101041106 (VA)
Also ListedPreventive Medicine · Aerospace MedicineTaxonomy 2083A0100X · License 0101041106 (VA)
Also ListedPreventive Medicine · Preventive Medicine/Occupational Environmental MedicineTaxonomy 2083P0500X · License 0101041106 (VA)
425 S PAYNE ST, Alexandria, VA 22314
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Secondary Practice Location 1

Location 1410 Government Ave Ste 1Valparaiso, FL 32580-1061 · Phone (703) 994-7637

Other Identifiers 2

Other0101041106VA · License
OtherME175967FL · License

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Janczewski's NPI number?

The NPI number for Mark Janczewski is 1124022843. It was assigned to this individual provider in the NPPES registry on June 9, 2005.

Where is Mark Janczewski located?

Mark Janczewski practices at 425 S Payne St, Alexandria, VA 22314. The listed phone number is (703) 994-7637.

What is Mark Janczewski's specialty?

The primary specialty registered for this NPI is Preventive Medicine, specializing in Clinical Informatics, with taxonomy code 2083C0008X.

When was this NPI record last updated?

The NPPES record for Mark Janczewski was last updated on September 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.