Matthew O'Brien, MD
NPI 1790304137 · Pediatric Cardiology Physician · New Haven, CT
Enrolled with Medicare as Order and Referring Only - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew O'Brien, MD is a Pediatric Cardiology Physician provider in New Haven, CT (NPI 1790304137).
Provider details
- NPI number
- 1790304137
- Entity type
- Individual
- Primary specialty
- Pediatric Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 75342 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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
- 2020-04-15
- Last updated
- 2024-08-07
- Certified
- 2024-08-07
Frequently asked questions
- What is Matthew O'Brien's NPI number?
- Matthew O'Brien's National Provider Identifier (NPI) is 1790304137, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew O'Brien's specialty?
- Matthew O'Brien is listed in the NPPES registry with a primary specialty of Pediatric Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew O'Brien located?
- Matthew O'Brien's practice location on file with NPPES is 20 York St, New Haven, CT 06510-3220.
- What is Matthew O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Matthew O'Brien is (203) 688-4242.
- Does Matthew O'Brien accept Medicare?
- Matthew O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew O'Brien's NPI active?
- Yes — Matthew O'Brien's NPI (1790304137) is active in the NPPES registry as of the last update on 2024-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.