Mark George Janczewski, MD, MPH

Primary specialty

Clinical Informatics PhysicianTaxonomy code 2083C0008X

License

0101041106 Issued in VA

Practice address

425 S Payne St
Alexandria, VA 22314-5944

Phone

(703) 994-7637

NPI assigned

Jun 9, 2005

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Other identifiers 2

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1118275200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756857600000",
    "number": "1124022843",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "425 S PAYNE ST",
            "city": "ALEXANDRIA",
            "state": "VA",
            "postal_code": "223145944",
            "telephone_number": "703-994-7637"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "425 S PAYNE ST",
            "city": "ALEXANDRIA",
            "state": "VA",
            "postal_code": "223145944",
            "telephone_number": "703-994-7637"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "410 Government Ave Ste 1",
            "address_purpose": "LOCATION",
            "city": "Valparaiso",
            "state": "FL",
            "postal_code": "325801061",
            "country_code": "US",
            "telephone_number": "703-994-7637",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "JANCZEWSKI",
        "first_name": "MARK",
        "middle_name": "GEORGE",
        "name_prefix": "Dr.",
        "credential": "MD, MPH",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2005-06-09",
        "last_updated": "2025-09-03",
        "certification_date": "2025-09-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2083P0500X",
            "taxonomy_group": "",
            "desc": "Preventive Medicine, Preventive Medicine/Occupational Environmental Medicine",
            "state": "VA",
            "license": "0101041106",
            "primary": false
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "VA",
            "license": "0101041106",
            "primary": false
        },
        {
            "code": "2083C0008X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Preventive Medicine, Clinical Informatics",
            "state": "VA",
            "license": "0101041106",
            "primary": true
        },
        {
            "code": "2083A0100X",
            "taxonomy_group": "",
            "desc": "Preventive Medicine, Aerospace Medicine",
            "state": "VA",
            "license": "0101041106",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "LICENSE",
            "identifier": "0101041106",
            "state": "VA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "LICENSE",
            "identifier": "ME175967",
            "state": "FL"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Natasia Nicole James
• Quinsentina James
• Thomas William Jamieson, M.D.
• Daniel Ziad Jamokha, DPT
• Abdorasool Janati, M.D.
• Michelle Y Jang
• Jessica Januszewski
• Jar Inc
• Latosha Jarman
• Krina Jasani, D.M.D

• Clinical Informatics Physician in Alexandria, VA
• Providers in Alexandria, VA by specialty
• Clinical Informatics Physician in Virginia

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 3, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.