Mark Greenstein, MD
NPI 1881692721 · Developmental - Behavioral Pediatrics Physician · Hartford, CT
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Greenstein, MD is a Developmental - Behavioral Pediatrics Physician provider in Hartford, CT (NPI 1881692721).
Provider details
- NPI number
- 1881692721
- Entity type
- Individual
- Primary specialty
- Developmental - Behavioral Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 025582 (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
20 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
- 2005-07-13
- Last updated
- 2023-11-29
Frequently asked questions
- What is Mark Greenstein's NPI number?
- Mark Greenstein's National Provider Identifier (NPI) is 1881692721, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Greenstein's specialty?
- Mark Greenstein is listed in the NPPES registry with a primary specialty of Developmental - Behavioral Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Greenstein located?
- Mark Greenstein's practice location on file with NPPES is 1000 Asylum Ave, Hartford, CT 06105-1719.
- What is Mark Greenstein's phone number?
- The practice phone number listed in the NPPES registry for Mark Greenstein is (860) 714-5319.
- Does Mark Greenstein accept Medicare?
- Mark Greenstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Greenstein's NPI active?
- Yes — Mark Greenstein's NPI (1881692721) is active in the NPPES registry as of the last update on 2023-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.