NPIMap

Individual provider Active NPI

Thomas E Maslen, M.D.

  • Internal Medicine Physician
  • Greenbelt, MD
National Provider Identifier
1699742791
Registry record updated Jul 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
D55559 Issued in MD
Practice address
7525 Greenway Center Dr
Suite 316
Greenbelt, MD 20770-3509
Phone
(301) 220-0200
Fax
(301) 345-6956
NPI assigned
Mar 7, 2006
Last updated
Jul 13, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 13, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X D55559 MD Primary

Addresses

Primary practice location

7525 Greenway Center Dr
Suite 316
Greenbelt, MD 20770-3509

Mailing address

7525 Greenway Center Dr
Suite 316
Greenbelt, MD 20770-3509
Phone (301) 220-0200

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in DC
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20090817000238 DC Practitioner - Internal Medicine 5294889861 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of Maryland School of Medicine, 1997
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Privia Care Center LLCGroup PAC ID 3274801139, 286 clinicians

Practice addresses (Care Compare)

7525 Greenway Ctr Dr
Suite 312
Greenbelt, MD 20770-3525
Phone (301) 220-0200

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Removal or shaving of skin growth1-10
Skin biopsy1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
D55559MDMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Privia Medical Group, LLC Internal Medicine CurrentSince Mar 8, 2016 Accepting new patients
Privia Care Center LLC Internal Medicine CurrentSince Apr 5, 2017 Accepting new patients
Privia Care Center LLC Internal Medicine CurrentSince Apr 5, 2017 Accepting new patients
Privia Medical Group, LLC CurrentSince Mar 8, 2016 Accepting new patients
Windber Hospital, Inc. Past Accepting new patients
Frederick Health Hospital Inc Past Accepting new patients

Locations

4910 Massachusetts Ave NW
Ste 114
Washington, DC 20016
Phone (202) 244-0812

7525 Greenway Center Dr
Ste 312
Greenbelt, MD 20770
Phone (301) 220-0200

9470 Annapolis Rd
Ste 309
Lanham, MD 20706
Phone (202) 832-1800

950 N Glebe Rd
Ste 700
Arlington, VA 22203
Phone (484) 228-1065

Interoperability endpoints

  • Direct secure messaging: thomas.maslen.1@8042.direct.athenahealth.com

Organizations & group practices 6

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 5

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

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

{
    "created_epoch": "1141689600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1699742791",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7525 GREENWAY CENTER DR",
            "address_2": "SUITE 316",
            "city": "GREENBELT",
            "state": "MD",
            "postal_code": "207703509",
            "telephone_number": "301-220-0200",
            "fax_number": "301-345-6956"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "7525 GREENWAY CENTER DR",
            "address_2": "SUITE 316",
            "city": "GREENBELT",
            "state": "MD",
            "postal_code": "207703509",
            "telephone_number": "301-220-0200",
            "fax_number": "301-345-6956"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MASLEN",
        "first_name": "THOMAS",
        "middle_name": "E",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-07",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MD",
            "license": "D55559",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Greenbelt, MD

Sources for this page

Verify at the official NPI Registry.