Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

MS. Mary J Brennan, APRN-BC

Individual provider Acute Care Nurse Practitioner · NPI 1699782623

MS. Mary J Brennan, APRN-BC is a Nurse Practitioner in Portland, Maine. Qualified in 2001, 25 years ago. Practices with Mainehealth, a 2,615-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Maine and New Hampshire.

Years since qualifying
25
Licensed in
ME, NH
In the registry since
2006
Specialties on file
3
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Practice location Address checks out

10 Andover Rd
Portland, ME 04102-1954
Phone: (207) 761-6642
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 333 Borthwick Ave, Portsmouth, NH 03801-7128 — (603) 334-2039

Specialties & licences

Acute Care Nurse Practitioner (primary) Taxonomy 363LA2100X · Licence CNP211468 (ME)
Acute Care Nurse Practitioner Taxonomy 363LA2100X · Licence 047934-23 (NH)
Hospitalist Physician Taxonomy 208M00000X · Licence 047934-23 (NH)

Record details

NPI number1699782623
Entity typeIndividual (Type 1)
GenderFemale
Credentials APRN-BC
Sole proprietorNo
NPI enumeratedAugust 2, 2006
Last updated in NPPESDecember 21, 2021
Certification dateDecember 21, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2001 (25 years in practice)
Group practice Mainehealth — 2615 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients25
Services billed 41 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Mainehealth

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2615 clinicians in the practice; 12 are shown here.

Other providers in Portland