Mary Brennan, CPNP
NPI 1336984368 · Pediatric Nurse Practitioner · Boston, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Brennan, CPNP is a Pediatric Nurse Practitioner provider in Boston, MA (NPI 1336984368).
Provider details
- NPI number
- 1336984368
- Entity type
- Individual
- Primary specialty
- Pediatric Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CPNP
- Sex
- Female
- Sole proprietor
- No
- License
- RN2334511 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 51 Blossom StBoston, MA 02114-2601Phone: (617) 722-6000
Registry dates
- Enumerated
- 2024-07-01
- Last updated
- 2025-03-26
- Certified
- 2025-03-26
Frequently asked questions
- What is Mary Brennan's NPI number?
- Mary Brennan's National Provider Identifier (NPI) is 1336984368, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Brennan's specialty?
- Mary Brennan is listed in the NPPES registry with a primary specialty of Pediatric Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Brennan located?
- Mary Brennan's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Mary Brennan's phone number?
- The practice phone number listed in the NPPES registry for Mary Brennan is (617) 355-6000.
- Does Mary Brennan accept Medicare?
- Mary Brennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Brennan's NPI active?
- Yes — Mary Brennan's NPI (1336984368) is active in the NPPES registry as of the last update on 2025-03-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.