Marissa Brennan, PA-C

Primary specialty

Medical Physician AssistantTaxonomy code 363AM0700X

License

3987 Issued in CT

Practice address

365 Montauk Ave
New London, CT 06320-4700

Phone

(860) 271-4364

Fax

(860) 444-5114

NPI assigned

Sep 7, 2017

Last updated

Sep 4, 2025By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Other names 1

• Marissa Tennant Former name

Medicare fee-for-service enrollment

Enrolled in CT, RI2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Physician Assistant

Education

Other, 2017

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Middlesex HospitalGroup PAC ID 5092611731, 231 clinicians

Hospital Medicine Associates LLCGroup PAC ID 9234156985, 208 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Lawrence & Memorial Hospital Hospital, New London, CT, CCN 070007
• Middlesex Hospital Hospital, Middletown, CT, CCN 070020

Medicare enrollment (NPD)

Enrolled

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mtennant347805@direct.ynhh.org

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.

• Middlesex Hospital

  • General Acute Care Hospital
  • Middletown, CT
  • NPI 1760454334
  Medicare reassignment Care Compare group NPD
• Hospital Medicine Associates LLC

  • Hospitalist Physician
  • Baton Rouge, LA
  • NPI 1093758781

  CT, RI

  Medicare reassignment Care Compare group
• Hartford Healthcare Medical Group Specialists, PLLC

  • Surgery Physician
  • Hartford, CT
  • NPI 1023584216
  Medicare reassignment NPD
• Hartford Healthcare Medical Group, Inc

  dba Hartford HealthCare Medical Group

  • Surgery Physician
  • Wethersfield, CT
  • NPI 1043561301

  Physician Assistant

  Medicare reassignment NPD
• Hartford Healthcare Medical Group Specialists LLC

  • Customized Equipment (DME)
  • Groton, CT
  • NPI 1295367068
  NPD
• Middlesex Hospital

  dba Middlesex Hospital Homecare and Hospice

  • Community Based Hospice Care Agency
  • Middletown, CT
  • NPI 1003873233
  NPD

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

• Lawrence and Memorial Hospital, Inc.

  dba Lawrence and Memorial Hospital

  • General Acute Care Hospital
  • New London, CT
  • NPI 1073530879
  Care Compare affiliation
• Lawrence and Memorial Hospital, Inc.

  dba Lawrence and Memorial Hospital

  • General Acute Care Hospital
  • New London, CT
  • NPI 1700092459
  Care Compare affiliation
• Middlesex Hospital

  • General Acute Care Hospital
  • Middletown, CT
  • NPI 1760454334
  Care Compare affiliation

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

{
    "created_epoch": "1504742400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756944000000",
    "number": "1902324205",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "365 MONTAUK AVE",
            "city": "NEW LONDON",
            "state": "CT",
            "postal_code": "063204700",
            "telephone_number": "860-271-4364",
            "fax_number": "860-444-5114"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "365 MONTAUK AVE",
            "city": "NEW LONDON",
            "state": "CT",
            "postal_code": "063204700",
            "telephone_number": "860-271-4364",
            "fax_number": "860-444-5114"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "25 Wells St",
            "address_purpose": "LOCATION",
            "city": "Westerly",
            "state": "RI",
            "postal_code": "028912922",
            "country_code": "US",
            "telephone_number": "401-596-6000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BRENNAN",
        "first_name": "MARISSA",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2017-09-07",
        "last_updated": "2025-09-04",
        "certification_date": "2025-09-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "NU",
            "license": null,
            "primary": false
        },
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "CT",
            "license": "3987",
            "primary": true
        },
        {
            "code": "363AM0700X",
            "taxonomy_group": "",
            "desc": "Physician Assistant, Medical",
            "state": "RI",
            "license": "PA01528",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARISSA",
            "last_name": "TENNANT",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Glenn Brady, MD.
• Kathryn Brady, MD
• Bobbi Brandau
• Garrett T Brennan, DDS
• Kelly Brennan, FNP
• Thomas Bresnahan
• Yardley Brice, DO
• Danielle R Brown, MS INTERN
• Rose Brown
• Kathleen Kimberly-Adams Brunault, PHARMD

• Medical Physician Assistant in New London, CT
• Providers in New London, CT by specialty
• Medical Physician Assistant in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 4, 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.