Child PsychiatryCooperative BehaviorDelivery of Health Care, Integrated
Dr. Gregory N. Hagan, MD
NPI1245203306
- Publications
- 1
- Hospital affiliations
- 1
- Industry payments
- $27
- Medical groups
- 2
- State license
- 1
- Practice address
- 1493 Cambridge Street, Cambridge, MA 02139
- Practice phone
- Call (617) 665-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hagan's professional email, personal email and mobile number
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Dr. Gregory N. Hagan is a pediatrician in Cambridge, Massachusetts
Dr. Hagan practices at CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance.
Dr. Hagan's NPI, 1245203306, was assigned on February 9, 2006. Dr. Hagan graduated from Tufts University School of Medicine in 1986. Dr. Hagan holds Massachusetts license 70814.
NPI and contact details
- NPI
- 1245203306NPI Registry (opens in a new tab)
- NPI enumeration date
- February 9, 2006
- NPI status
- Active
- Practice phone
- (617) 665-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gregory N. Hagan practices at CHA Cambridge Hospital in Cambridge, Massachusetts
Dr. Hagan's primary practice is CHA Cambridge Hospital, at 1493 Cambridge Street, Cambridge, MA 02139 in Middlesex County. The practice phone is (617) 665-1000.
- CHA Cambridge Hospital1493 Cambridge Street, Cambridge, MA 02139 · Middlesex CountyPhone(617) 665-1000
Source: Dmand AI Affiliation Data
Dr. Gregory N. Hagan is affiliated with 3 sites of care and 2 medical groups
Dr. Hagan's primary practice is CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance. The medical group on file is Cambridge Health Alliance. Dmand AI also links Dr. Hagan to 2 more group practices and clinics and 1 medical group, each named with a free account. Dr. Hagan's employer is on file too: a hospital.
Cambridge Health Alliance2 group practices and clinicsNames with a free account1 medical groupName with a free accountEmployer: hospitalName with a free account
See all 5 affiliations for Dr. HaganSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory N. Hagan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hagan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| CHA Cambridge Hospital | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory N. Hagan is one of 2,101 pediatricians in Massachusetts
Pediatrics is Dr. Hagan's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Hagan is licensed in Massachusetts.
Specialties and state licenses
- Pediatrics, MassachusettsPrimary
Pediatricians near Dr. Hagan
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
2,101pediatricians in Massachusetts49pediatricians in Cambridge26pediatricians at CHA Cambridge Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory N. Hagan's patients have a median age of 23
Across all payers, Dmand AI patient panel data puts Dr. Hagan's median patient age at 23, with 38% women.
Dr. Hagan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 23
Patient panel by sex, all payers
- Women38%
- Men62%
Source: Dmand AI Patient Panel Data
Dr. Gregory N. Hagan has 1 publication on record
Dmand AI links 1 paper to Dr. Hagan in 2018. Dr. Hagan's most frequent co-author is Katherine E. Grimes, MD, MPH.
Papers1
Dr. Hagan's most frequent co-authors
Recent publications by Dr. Hagan
See who Dr. Hagan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hagan works with, so you can find a warm path to the right pediatricians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory N. Hagan received $27 in industry payments in 2023
CMS Open Payments shows 1 general payment to Dr. Hagan from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Inari Medical, Inc. paid the most, $27.
Companies that paid Dr. Hagan the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory N. Hagan graduated from Tufts University School of Medicine
Dr. Hagan graduated from Tufts University School of Medicine in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory N. Hagan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory N. Hagan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory N. Hagan's NPI number?
Dr. Gregory N. Hagan's NPI number is 1245203306. It was assigned on February 9, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory N. Hagan?
Dr. Gregory N. Hagan is a pediatrician in Cambridge, Massachusetts. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Gregory N. Hagan practice?
Dr. Hagan practices at 1493 Cambridge Street, Cambridge, MA 02139. Dr. Hagan's primary practice is CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance. Dmand AI also links Dr. Hagan to 2 group practices and clinics and 1 medical group.
What is Dr. Gregory N. Hagan's office phone number?
The practice phone on file for Dr. Hagan is (617) 665-1000.
What is Dr. Gregory N. Hagan's medical license number?
Dr. Hagan holds Massachusetts license 70814.
Which hospitals is Dr. Gregory N. Hagan affiliated with?
Dr. Hagan practices at CHA Cambridge Hospital in Cambridge, Massachusetts.
What medical group is Dr. Gregory N. Hagan part of?
Dr. Hagan is linked to Cambridge Health Alliance. Dmand AI links Dr. Hagan to 1 more medical group.
Where did Dr. Gregory N. Hagan go to medical school?
Dr. Hagan graduated from Tufts University School of Medicine in 1986.
Has Dr. Gregory N. Hagan received payments from drug or device companies?
CMS Open Payments shows $27 in general payments to Dr. Hagan from 1 company from 2023 to 2023. The largest total came from Inari Medical, Inc.
How long has Dr. Gregory N. Hagan been practicing?
Dr. Hagan graduated from medical school in 1986, 40 years ago.
Does Dr. Gregory N. Hagan do research?
Dmand AI links 1 publication to Dr. Hagan.
Who does Dr. Gregory N. Hagan publish with?
Dr. Hagan's most frequent co-authors are Katherine E. Grimes, MD, MPH (1 shared paper).
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