Gregory Brennan, PA-C
NPI 1629300124 · Physician Assistant · Boston, MA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Brennan, PA-C is a Physician Assistant provider in Boston, MA (NPI 1629300124).
Provider details
- NPI number
- 1629300124
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 0758 (NH)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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
Registry dates
- Enumerated
- 2010-02-08
- Last updated
- 2012-01-11
Frequently asked questions
- What is Gregory Brennan's NPI number?
- Gregory Brennan's National Provider Identifier (NPI) is 1629300124, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Brennan's specialty?
- Gregory Brennan is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gregory Brennan located?
- Gregory Brennan's practice location on file with NPPES is 147 Milk St, Boston, MA 02109-4806.
- What is Gregory Brennan's phone number?
- The practice phone number listed in the NPPES registry for Gregory Brennan is (617) 559-8239.
- Does Gregory Brennan accept Medicare?
- Gregory Brennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Brennan's NPI active?
- Yes — Gregory Brennan's NPI (1629300124) is active in the NPPES registry as of the last update on 2012-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.