Mary Brennan, MD
NPI 1033565668 · Pediatrics Physician · Valhalla, NY
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Brennan, MD is a Pediatrics Physician provider in Valhalla, NY (NPI 1033565668).
Provider details
- NPI number
- 1033565668
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2016-05-12
- Last updated
- 2019-08-29
Frequently asked questions
- What is Mary Brennan's NPI number?
- Mary Brennan's National Provider Identifier (NPI) is 1033565668, 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 Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Brennan located?
- Mary Brennan's practice location on file with NPPES is 100 Woods Rd, Valhalla, NY 10595-1530.
- What is Mary Brennan's phone number?
- The practice phone number listed in the NPPES registry for Mary Brennan is (914) 493-7000.
- 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 (1033565668) is active in the NPPES registry as of the last update on 2019-08-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.