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MARISSA BRENNAN PA-C
NPI 1902324205
Physician Assistant - Medical in New London, CT

Active since September 07, 2017PECOS EnrolledAccepts Medicare Assignment
365 MONTAUK AVE, NEW LONDON, CT 06320(860) 271-4364(860) 444-5114 Get Directions Write a Review

NPPES record last updated: September 4, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Sep 4, 2025, Jul 17, 2023, Dec 7, 2021 (3 updates tracked since 2021).

About Marissa Brennan Pa-c NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARISSA BRENNAN PA-C (NPI 1902324205) is an individual medical provider in New London, Connecticut, licensed in Connecticut (3987) and active in the NPI registry since September 2017. She is enrolled in Medicare PECOS, maintains a secondary practice location in Westerly, and is a graduate of Other (2017).

NPPES Registry Identity

NPI1902324205
Entity TypeIndividualFemale
Primary Taxonomy363AM0700X
Provider Legal NameMARISSA BRENNANCredential: PA-C
Location Address365 MONTAUK AVENew London, CT 06320-4700
Mailing Address365 Montauk AveNew London, CT 06320-4700 · (860) 271-4364 · Fax (860) 444-5114
Phone(860) 271-4364
Fax(860) 444-5114
Sole ProprietorNo
Medical School CMSOtherGraduated 2017
Enumeration DateSeptember 7, 2017
Last NPPES UpdateSeptember 4, 20253 updates tracked since enumeration
NPPES CertifiedSeptember 4, 2025
✔ NPI 1902324205 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPhysician Assistant · MedicalPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363AM0700X
Licenses✔ Licensed in CT · 3987✔ Licensed in RI · PA01528
Also ListedPhysician AssistantTaxonomy 363A00000X
365 MONTAUK AVE, New London, CT 06320
Open in Google Maps ↗

Other Names 1

Former Name (1)Marissa Tennant

Secondary Practice Location 1

Location 125 Wells StWesterly, RI 02891-2922 · Phone (401) 596-6000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Marissa Brennan Pa-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3375804107
PECOS Enrollment IDI20180219001347
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
377 services186 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
143 services140 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
140 services97 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
94 services45 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
30 services29 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
22 services21 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Care Plan
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…
92%274 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. STEVEN LU M.D.
Internal Medicine
365 MONTAUK AVE, RM 4.512
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711
MR. WILLIAM EDWIN SHEA PA-C
Physician Assistant
365 MONTAUK AVE, LAWRENCE AND MEMORIAL HOSPITAL
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 441-0711
DR. NICHOLAS R. SALERNO M.D.
Radiology (Diagnostic Radiology)
365 MONTAUK AVE
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 444-5151
CURT WILSON GRAMLICH MD
Anesthesiology
365 MONTAUK AVE
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711
KATHERINE FRANCES MCGOWAN HESSE MD
Emergency Medicine
365 MONTAUK AVE
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711
CHRISTOPHER JALBERT M.D.
Internal Medicine
365 MONTAUK AVE, ROOM 4.512
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711
TARA HOOD NP
Nurse Practitioner
365 MONTAUK AVE, ROOM 4.512
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711
ERIC BALCH M.D.
Anesthesiology
365 MONTAUK AVE, ANESTHESIA DEPARTMENT
NEW LONDON, CT 06320
Southeastern Connecticut Planning Region (860) 442-0711

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marissa Brennan's NPI number?

The NPI number for Marissa Brennan is 1902324205. It was assigned to this individual provider in the NPPES registry on September 7, 2017. The provider is also known as Marissa Tennant.

Where is Marissa Brennan located?

Marissa Brennan practices at 365 Montauk Ave, New London, CT 06320. The listed phone number is (860) 271-4364.

What is Marissa Brennan's specialty?

The primary specialty registered for this NPI is Physician Assistant, specializing in Medical, with taxonomy code 363AM0700X.

Is Marissa Brennan enrolled in Medicare?

Yes. Marissa Brennan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Marissa Brennan was last updated on September 4, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.