MARY THERESA BRENNAN CPNP
NPI 1336984368
Nurse Practitioner - Pediatrics in Boston, MA
About Mary Theresa Brennan Cpnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY THERESA BRENNAN CPNP (NPI 1336984368) is an individual pediatrics provider in Boston, Massachusetts, licensed in Massachusetts (RN2334511) and active in the NPI registry since July 2024. She is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Other (2024).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mary Theresa Brennan Cpnp 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.
Medicare Billing Reassignments
2Medicare enrollment records show Mary Brennan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 1,358 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 128 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Mary Brennan's NPI number?
The NPI number for Mary Brennan is 1336984368. It was assigned to this individual provider in the NPPES registry on July 1, 2024.
Where is Mary Brennan located?
Mary Brennan practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Mary Brennan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Pediatrics, with taxonomy code 363LP0200X.
Is Mary Brennan enrolled in Medicare?
Yes. Mary 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.
Which organizations bill Medicare for Mary Brennan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Brennan reassigns Medicare benefits to 2 organizations: Children's Hospital Pediatric Associates, Inc (Boston, MA) and The Shriners' Hospital For Children (Boston, MA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mary Brennan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Brennan accept?
Health plans from Taro Health list Mary Brennan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Mary Brennan was last updated on March 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mary Theresa Brennan, CPNP · NPI 1336984368
Pediatrics physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since July 1, 2024.
## Identity
- **NPI:** 1336984368 (Entity type: Individual)
- **Enumerated:** July 1, 2024
- **Primary specialty:** Nurse Practitioner - Pediatrics · taxonomy 363LP0200X
- **State license:** RN2334511 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA); The Shriners' Hospital For Children (NPI 1366886525, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** March 26, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1336984368) · Data from the CMS NPPES public registry.