Marissa Brennan, PA-C
- Medicare patients, 2024
- 339
- Part D claims, 2024
- 233
- Hospital affiliations
- 2
- Medical groups
- 4
- State licenses
- 2
- Practice address
- 365 Montauk Ave, New London, CT 06320
- Practice phone
- Call (860) 442-0711
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Marissa Brennan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Marissa Brennan is a physician assistant in New London, Connecticut
Marissa Brennan practices at Lawrence + Memorial Hospital in New London, Connecticut, part of Yale New Haven Health System.
Marissa Brennan's NPI, 1902324205, was assigned on September 7, 2017. Marissa Brennan holds Connecticut license 3987.
- NPI
- 1902324205NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375804107
- NPI enumeration date
- September 7, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (860) 442-0711
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Marissa Brennan practices at Lawrence + Memorial Hospital in New London, Connecticut
Marissa Brennan's primary practice is Lawrence + Memorial Hospital, at 365 Montauk Ave, New London, CT 06320 in New London County. The practice phone is (860) 442-0711.
- Lawrence + Memorial Hospital365 Montauk Ave, New London, CT 06320 · New London CountyPhone(860) 442-0711
Source: Dmand AI Affiliation Data
Marissa Brennan is affiliated with 3 sites of care and 4 medical groups
Marissa Brennan's primary practice is Lawrence + Memorial Hospital in New London, Connecticut, part of Yale New Haven Health System. Marissa Brennan is also affiliated with Middlesex Hospital. The medical group on file is Hartford HealthCare Medical Group Specialists. Dmand AI also links Marissa Brennan to 3 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Marissa Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Marissa Brennan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lawrence + Memorial Hospital | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Yale New Haven Health System and 6.2K+ hospitals, with verified contacts in the same login.
Marissa Brennan is one of 888 physician assistants in Connecticut
Medical is Marissa Brennan's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. Dmand AI has Marissa Brennan's licenses on file in 2 states: Connecticut and Rhode Island.
Specialties and state licenses
- Medical physician assistant, ConnecticutPrimary
- Rhode Island license
Physician assistants near Marissa Brennan
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Marissa Brennan treated 339 Medicare patients in 2024, average age 78
CMS counts 339 Medicare patients who saw Marissa Brennan in 2024. The largest group is 75 to 84, with 119 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 36% are also on Medicaid. Their average risk score is 2.68, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Marissa Brennan's median patient age at 69, with 51% women.
Marissa Brennan's Medicare patients by age, 2024
Marissa Brennan's Medicare patients by sex, 2024
- Women19156%
- Men14844%
Chronic conditions among Marissa Brennan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis64%
- Mood disorders53%
- Anxiety51%
- Chronic kidney disease50%
- Heart failure50%
- Atrial fibrillation47%
Share of Medicare patients with each condition. A patient can have several.
Marissa Brennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Marissa Brennan wrote 233 Medicare Part D claims in 2024
In 2024, Marissa Brennan wrote 233 Medicare Part D claims for 127 patients. 88% of them were for generic drugs.
Marissa Brennan's Part D claims by kind of drug, 2024
- Generic204 claims88%
- Brand-name and other29 claims12%
Drug classes CMS tracks in Marissa Brennan's Part D claims, 2024
- Antibiotics15%36 of 233 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Marissa Brennan takes part in Medicare
Marissa Brennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Sources for Marissa Brennan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Marissa Brennan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Marissa Brennan's NPI number?
Marissa Brennan's NPI number is 1902324205. It was assigned on September 7, 2017, and it is active in the NPI Registry.
What does Marissa Brennan specialize in?
Marissa Brennan is a physician assistant in New London, Connecticut. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).
Where does Marissa Brennan practice?
Marissa Brennan practices at 365 Montauk Ave, New London, CT 06320. Marissa Brennan's primary practice is Lawrence + Memorial Hospital in New London, Connecticut, part of Yale New Haven Health System. Dmand AI also links Marissa Brennan to 3 medical groups and 1 group practice or clinic.
What is Marissa Brennan's office phone number?
The practice phone on file for Marissa Brennan is (860) 442-0711.
What is Marissa Brennan's medical license number?
Marissa Brennan holds Connecticut license 3987, one of the licenses on file in 2 states.
Which states has Marissa Brennan been licensed in?
Dmand AI has state licenses on file for Marissa Brennan in Connecticut and Rhode Island.
Which hospitals is Marissa Brennan affiliated with?
Marissa Brennan practices at Lawrence + Memorial Hospital in New London, Connecticut. Marissa Brennan is also affiliated with Middlesex Hospital.
What medical group is Marissa Brennan part of?
Marissa Brennan is linked to Hartford HealthCare Medical Group Specialists. Dmand AI links Marissa Brennan to 3 more medical groups.
Does Marissa Brennan accept Medicare?
Yes. CMS lists Marissa Brennan as accepting Medicare assignment.
How many Medicare patients does Marissa Brennan see?
CMS counts 339 Medicare patients who saw Marissa Brennan in 2024, with an average age of 78.
How long has Marissa Brennan been practicing?
Marissa Brennan graduated from medical school in 2017, 9 years ago.
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