Gregory Hagan, MD
NPI 1245203306 · Pediatrics Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Hagan, MD is a Pediatrics Physician provider in Cambridge, MA (NPI 1245203306).
Provider details
- NPI number
- 1245203306
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 70814 (MA)
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
- 2006-02-09
- Last updated
- 2011-11-21
Frequently asked questions
- What is Gregory Hagan's NPI number?
- Gregory Hagan's National Provider Identifier (NPI) is 1245203306, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Hagan's specialty?
- Gregory Hagan is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Hagan located?
- Gregory Hagan's practice location on file with NPPES is 119 Windsor St, Cambridge, MA 02139-3647.
- What is Gregory Hagan's phone number?
- The practice phone number listed in the NPPES registry for Gregory Hagan is (617) 665-3600.
- Does Gregory Hagan accept Medicare?
- Gregory Hagan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Hagan's NPI active?
- Yes — Gregory Hagan's NPI (1245203306) is active in the NPPES registry as of the last update on 2011-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.