Quick answers
- Which hospitals does Marissa Brennan work at?
- Medicare's official clinician data lists Marissa Brennan at 2 hospitals: Lawrence & Memorial Hospital and Middlesex Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marissa Brennan see patients?
- Medicare's clinician data lists 3 practice locations, including Westbrook, CT, Middletown, CT and New London, CT. Call before your visit to confirm the address.
- What is Marissa Brennan's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Marissa Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa Brennan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Marissa Brennan?
- (860) 358-3700, as listed in official Medicare / NPI Registry data.
- What is Marissa Brennan's NPI number?
- 1902324205. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marissa Brennan works
Medicare's Facility Affiliation Data lists Marissa Brennan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lawrence & Memorial HospitalNew London, CT · Acute Care Hospital · CCN 070007
- Middlesex HospitalMiddletown, CT · Acute Care Hospital · CCN 070020
Practice locations
Addresses where Marissa Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 250 Flat Rock PlWestbrook, CT 06498 (860) 358‑3700
- 28 Crescent StMiddletown, CT 06457 (860) 358‑6000
- 365 Montauk AveNew London, CT 06320 (860) 442‑0711
Group practices
Medicare enrollment lists Marissa Brennan as a member of these groups (CMS data updated 2026-10-02).
- Middlesex Hospital234 clinicians in the group
- Hospital Medicine Associates LLC211 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Westbrook
Clinicians with the same Medicare primary specialty in Westbrook, CT — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902324205 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians