Margaret Mary Brennan, M.D.

Primary specialty

Cardiovascular Disease PhysicianTaxonomy code 207RC0000X

License

D35595 Issued in MD

Practice address

6569 N Charles St
Suite 600
Baltimore, MD 21204-6831

Phone

(443) 849-8989

NPI assigned

Oct 11, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in MD

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mbrennan35393@direct.hopkinsmedicine.org

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.

• Johns Hopkins University

  • Pain Medicine (Anesthesiology) Physician
  • Baltimore, MD
  • NPI 1922008549
  Medicare reassignment NPD
• Johns Hopkins University

  • Ophthalmology Physician
  • Belcamp, MD
  • NPI 1376342774
  NPD
• Johns Hopkins University

  • Cardiovascular Disease Physician
  • Baltimore, MD
  • NPI 1801891080
  NPD
• Saint Thomas Medical Partners

  • Internal Medicine Physician
  • Nashville, TN
  • NPI 1437194669

  Cardiovascular Disease

  NPD (past)

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

{
    "created_epoch": "1160524800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786838400000",
    "number": "1851489207",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6201 GREENLEIGH AVE",
            "city": "MIDDLE RIVER",
            "state": "MD",
            "postal_code": "212202004"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6569 N CHARLES ST",
            "address_2": "SUITE 600",
            "city": "BALTIMORE",
            "state": "MD",
            "postal_code": "212046831",
            "telephone_number": "443-849-8989"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BRENNAN",
        "first_name": "MARGARET",
        "middle_name": "MARY",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-10-11",
        "last_updated": "2026-08-16",
        "certification_date": "2022-09-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "TN",
            "license": "15409",
            "primary": false
        },
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "MD",
            "license": "D35595",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "533771200",
            "state": "MD"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Emily Brennan, RN
• Erin Elizabeth Brennan, CRNP-PMH
• James Charles Brennan Jr., PA-C
• Komila Dadakhodjaeva Brennan, PHD
• Luke Brennan, PH.D.
• Nancyellen Brennan, C.R.N.P.
• Cecilia Margaret Brennecke, M.D.
• Mary Brenneman, LCSW-C
• Chaya Brenner
• Joel I Brenner, M.D.

• Cardiovascular Disease Physician in Baltimore, MD
• Providers in Baltimore, MD by specialty
• Cardiovascular Disease Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 16, 2026; 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.