Marcia Tonnesen, M.D.

Primary specialty

Dermatology PhysicianTaxonomy code 207N00000X

License

181378 Issued in NY

Practice address

181 N Belle Mead Rd
East Setauket, NY 11733-3495

Phone

(631) 444-4200

NPI assigned

May 27, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 3

Medicare fee-for-service enrollment

Enrolled in NY

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

Dermatology

Education

University of Utah School of Medicine, 1973

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• Healthfirst Medicare Network H3359
• Healthfirst Medicare Network H9678
• Healthfirst Medicare Network H1722
• Healthfirst Medicare Network H5989

Interoperability endpoints

• Direct secure messaging: marcia.tonnesen@direct.stonybrookmedicine.edu

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.

• Stony Brook Dermatology Associates, University Faculty Practice Corpor

  • Dermatology Physician
  • Stony Brook, NY
  • NPI 1497700819
  NPD

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

{
    "created_epoch": "1148688000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1205883238",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 1559",
            "city": "STONY BROOK",
            "state": "NY",
            "postal_code": "117900989",
            "telephone_number": "631-444-4200"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "181 N BELLE MEAD RD",
            "city": "EAST SETAUKET",
            "state": "NY",
            "postal_code": "117333495",
            "telephone_number": "631-444-4200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "TONNESEN",
        "first_name": "MARCIA",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-05-27",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207N00000X",
            "taxonomy_group": "",
            "desc": "Dermatology",
            "state": "NY",
            "license": "181378",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "5030064",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "EMPIRE BC/BS",
            "identifier": "61F93",
            "state": "NY"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "01198109",
            "state": "NY"
        }
    ],
    "endpoints": [],
    "other_names": []
}

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• Lauren E Tjimos, NP
• James Edward Townsend, D.O.
• Toni Ann Traschetti, RPA-C
• Jeffrey Trilling, M.D.
• Ingrid Trouve, M.S. ED, SAS - SDA
• Sean P Trujillo, DC

• Dermatology Physician in East Setauket, NY
• Providers in East Setauket, NY by specialty
• Dermatology Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.
• 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.