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NPISignal

Individual Healthcare Provider

Mark George Janczewski, MD, MPH

NPI Record: ActivePreventive Medicine — Clinical Informatics
NPI1124022843
Alexandria, Virginia

Provider's NPPES record last updated: September 3, 2025

Overview

Entity Type
Individual Healthcare Provider
NPI
1124022843
Primary Specialty
Preventive Medicine — Clinical Informatics
Practice Location
Alexandria, Virginia
Sole Proprietor
Yes

Federal Screening

NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.

List of Excluded Individuals/Entities (LEIE)

HHS Office of Inspector General

No potential match identified

No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.

Source data
September 10, 2026
Records indexed
84,001
Screened
Sep 17, 2026, 11:51 PM UTC

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

SAM.gov Exclusions

U.S. General Services Administration

Not checked

SAM.gov Exclusions was not checked.

SAM.gov screening is not configured on this deployment. No SAM check has been performed.

Screened
Not checked

This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.

This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.

Run a name-based screening

Searches OIG LEIE and SAM.gov by name and reviews every potential match.

Specialties & Taxonomies

  • Preventive Medicine

    Clinical Informatics

    Allopathic & Osteopathic Physicians

    Primary

    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.

    Taxonomy code 2083C0008X
  • Preventive Medicine

    Preventive Medicine/Occupational Environmental Medicine

    Allopathic & Osteopathic Physicians

    A preventive medicine physician who specializes in preventive medicine/occupational-environmental medicine, which is focused on protecting the population from occupational and environmental conditions.

    Taxonomy code 2083P0500X
  • Family Medicine

    Allopathic & Osteopathic Physicians

    Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

    Taxonomy code 207Q00000X
  • Preventive Medicine

    Aerospace Medicine

    Allopathic & Osteopathic Physicians

    Aerospace medicine focuses on the clinical care, research, and operational support of the health, safety, and performance of crewmembers and passengers of air and space vehicles, together with the support personnel who assist operation of such vehicles. This population often works and lives in remote, isolated, extreme, or enclosed environments under conditions of physical and psychological stress. Practitioners strive for an optimal human-machine match in occupational settings rich with environmental hazards and engineering countermeasures.

    Taxonomy code 2083A0100X

Provider-Reported License Information

Preventive Medicine (Virginia)
0101041106
Preventive Medicine (Virginia)
0101041106
Family Medicine (Virginia)
0101041106
Preventive Medicine (Virginia)
0101041106
License numbers are reported by the provider to NPPES and are not independently verified by NPISignal against any state licensing board. Confirm current license status directly with the issuing state board.

Practice Locations

Practice Location

425 S Payne St

Alexandria, Virginia 22314-5944

Phone: (703) 994-7637

Additional Practice Location

410 Government Ave Ste 1

Valparaiso, Florida 32580-1061

Phone: (703) 994-7637

Record Information

Enumeration Date
June 9, 2005
Provider's NPPES Record Last Updated
September 3, 2025
Certification Date
September 3, 2025
NPISignal NPPES Dataset
August 2026

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