Alexander Nissen

Primary specialty

Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianTaxonomy code 208G00000X

License

0101263081 Issued in VA

Practice address

Walter Reed National Military Medical Center
8901 Wisconsin Ave
Bethesda, MD 20889-0004

Phone

(703) 401-2509

NPI assigned

Mar 10, 2016

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in DC

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Cardiac Surgery

Education

Other, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Medstar Medical Group II LLCGroup PAC ID 0547413825, 3,726 clinicians

Medstar Heart Institute LLCGroup PAC ID 5698932960, 308 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Medstar Health Home Care Home health agency, Hyattsville, MD, CCN 217150
• Medstar Washington Hospital Center Hospital, Washington, DC, CCN 090011

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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

• Medstar Medical Group II LLC

  • General Practice Physician
  • Baltimore, MD
  • NPI 1184046187

  DC

  Medicare reassignment Care Compare group NPD
• Medstar Heart Institute LLC

  • Surgery Physician
  • Washington, DC
  • NPI 1528345378
  Medicare reassignment Care Compare group NPD
• Frederick Health Hospital Inc

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  NPD (past)
• Medstar Medical Group II LLC

  • Internal Medicine Physician
  • Washington, DC
  • NPI 1376887844
  NPD (past)

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

• Medstar Health Visiting Nurse Association, Inc.

  • Home Health Agency
  • Greenbelt, MD
  • NPI 1154437879
  Care Compare affiliation
• Medstar Washington Hospital Center

  • General Acute Care Hospital
  • Washington, DC
  • NPI 1548378235
  Care Compare affiliation

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

{
    "created_epoch": "1457568000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1755648000000",
    "number": "1730540386",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "WALTER REED NATIONAL MILITARY MEDICAL CENTER",
            "address_2": "8901 WISCONSIN AVE",
            "city": "BETHESDA",
            "state": "MD",
            "postal_code": "208890004",
            "telephone_number": "703-401-2509"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "WALTER REED NATIONAL MILITARY MEDICAL CENTER",
            "address_2": "8901 WISCONSIN AVE",
            "city": "BETHESDA",
            "state": "MD",
            "postal_code": "208890004",
            "telephone_number": "703-401-2509"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "NISSEN",
        "first_name": "ALEXANDER",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2016-03-10",
        "last_updated": "2025-08-20",
        "certification_date": "2025-08-20",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208D00000X",
            "taxonomy_group": "",
            "desc": "General Practice",
            "state": "VA",
            "license": "0101263081",
            "primary": false
        },
        {
            "code": "208G00000X",
            "taxonomy_group": "",
            "desc": "Thoracic Surgery (Cardiothoracic Vascular Surgery)",
            "state": "VA",
            "license": "0101263081",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Aierken Nilubaier, PT
• Kesinee C. Nimit, M.D.
• Ajus K. Ninan, LCSW, PHD
• Jan Rwendel De Veyra Nirza, RN
• Masayo Nishida
• Elpida Hope Michael Nissirios, PSYD
• Manette Niu, M.D.
• Joshua T Nixon
• Igboanuzuo Ndidi Rosita Njaka, AGPCNP-BC
• Christine Nkobena, PHARMD.

• Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Bethesda, MD
• Providers in Bethesda, MD by specialty
• Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 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; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.