NPIMap

Organization Active NPI

Loudoun Medical Group, PC

  • Infectious Disease Physician
  • Leesburg, VA
National Provider Identifier
1164546529
Registry record updated Nov 20, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Infectious Disease PhysicianTaxonomy code 207RI0200X
Legal business name
LOUDOUN MEDICAL GROUP, PC
Practice address
44035 Riverside Parkway, Suite 440
Leesburg, VA 20176-8260
Phone
(703) 858-9966
Fax
(703) 858-9177
NPI assigned
Mar 19, 2007
Organization subpart
Yes
Parent organization
LOUDOUN MEDICAL GROUP, PCAs reported in NPPES

Authorized official

NPPES NPI Registry
Name
Mary Beth Tamasy
Title
Ceo
Phone
(703) 737-6010

Parent organization (reported in NPPES) 1

This organization reports itself as a subpart in NPPES; the parent’s legal name matches this organization in the same state.

Other NPIs on the same Medicare enrollment 25

NPIs listed together on one Medicare enrollment, typically parts of the same organization.

View all 25

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in VA

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20041115000474 VA Part B Supplier - Clinic/Group Practice 0042119661 Receives reassigned benefits from 340 practitioners
32 other NPIs on this enrollment
This NPI is an additional NPI on the enrollment

National Provider Directory

National Provider Directory
Tax ID family
Walter M Obrien MD305 organizations share this tax ID, including this one
Part of
Walter M Obrien MD

Organizations with this tax ID in the same state 24

This tax ID family is large, so up to 24 of its organizations in the same state are linked here.

View all 24

Specialties & licenses 1

NPPES NPI Registry
Specialty (taxonomy)CodeLicenseStatePrimary
Infectious Disease PhysicianGroup: 193400000X SINGLE SPECIALTY GROUP 207RI0200X Primary

Addresses

NPPES NPI Registry

Primary practice location

44035 Riverside Parkway, Suite 440
Leesburg, VA 20176-8260

Mailing address

224D Cornwall St NW Ste 403
Leesburg, VA 20176-2704
Phone (703) 737-6001

Other practice location 1

4320 Seminary Rd
Alexandria, VA 22304-1535
Phone (703) 504-3000

Other names 1

NPPES NPI Registry
  • Infectious Diseases, Tropical Medicine & Travel Clinic Doing business as

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format, last updated by the provider on Nov 20, 2025.

{
    "created_epoch": "1174262400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1763596800000",
    "number": "1164546529",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "224D CORNWALL ST NW STE 403",
            "city": "LEESBURG",
            "state": "VA",
            "postal_code": "201762704",
            "telephone_number": "703-737-6001",
            "fax_number": "571-291-9786"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "44035 RIVERSIDE PARKWAY, SUITE 440",
            "city": "LEESBURG",
            "state": "VA",
            "postal_code": "201768260",
            "telephone_number": "703-858-9966",
            "fax_number": "703-858-9177"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4320 Seminary Rd",
            "address_purpose": "LOCATION",
            "city": "Alexandria",
            "state": "VA",
            "postal_code": "223041535",
            "country_code": "US",
            "telephone_number": "703-504-3000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "LOUDOUN MEDICAL GROUP, PC",
        "organizational_subpart": "YES",
        "parent_organization_legal_business_name": "LOUDOUN MEDICAL GROUP, PC",
        "enumeration_date": "2007-03-19",
        "last_updated": "2025-11-20",
        "certification_date": "2025-11-20",
        "status": "A",
        "authorized_official_last_name": "TAMASY",
        "authorized_official_first_name": "MARY BETH",
        "authorized_official_title_or_position": "CEO",
        "authorized_official_telephone_number": "703-737-6010"
    },
    "taxonomies": [
        {
            "code": "207RI0200X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Internal Medicine, Infectious Disease",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Infectious Diseases, Tropical Medicine & Travel Clinic",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

Other providers in Leesburg, VA

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 20, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.