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Dr. Gregory N Hagan , MD

Pediatrics • Cambridge, MA

Active NPI 1245203306 Individual Practitioner Male Practitioner
Practice location in NPPES

119 Windsor St, Windsor Street Health Center
Cambridge, MA 021393647

Call 6176653600 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

119 Windsor St
Windsor Street Health Center

Cambridge, MA 021393647

Telephone 6176653600
Fax 6176653603
Organization at the Same NPPES Address or Phone
Windsor Health Center Facility NPI 1669773016

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Industry payments (Open Payments)

Fewer than 11 payment records totaling $27.35 in 2023

Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.

These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.

General: payments not tied to research, such as meals, travel, consulting or speaking fees.

A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.

Source: CMS Open Payments, program year 2023.

Guide: How to read an Open Payments record

NPI first issued

2006

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Medicare assignment not listed

CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Dr. Hagan has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Dr. Hagan as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Cambridge and Massachusetts

58 active clinicians are listed under Pediatrics with a practice address in Cambridge, MA (2,628 in Massachusetts).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Cambridge

1.7% of these 58 clinicians have the CMS telehealth indicator.

5.2% of these 58 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Open Payments (2023), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo · Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments · Program Year 2023

Program year 2023 (payments made January 1 – December 31, 2023): fewer than 11 records totaling $27.35.

Manufacturer Payment Nature Product Type Amount ($)
Inari Medical, Inc.
Food and Beverage
In-kind items and services
FLOWTRIEVER CATHETER, S General $27.35

Source: CMS Open Payments, program year 2023, released June 30, 2026.

Specialties & License Numbers Reported to NPPES

Pediatrics Primary Specialty

NUCC Taxonomy Code: 208000000X

License # reported to NPPES MA 70814

A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Massachusetts Board of Registration in Medicine.
Look Up on State Board Site

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid ID
3091562 (MA)
Other Identifier Tufts
714861
Other Identifier Bcbs
J09328

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - CRITICAL CARE (INTENSIVISTS)

Medicare Enrollment ID

I20070921000389

Enrollment State Jurisdiction

MA

PECOS Control ID

9133213150

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

17 listed
Juliana Antonucci

Nurse Practitioner - Family

NPI 1821717877
Vikas Gampa

Internal Medicine

NPI 1053765297
Marie Girault , NP

Nurse Practitioner

NPI 1043379191

Nurse Practitioner

Dr. Agnes Graves , MD

Internal Medicine

NPI 1932160934

Doctor of Medicine (M.D.)

NPI 1699700682

Doctor of Medicine (M.D.)

Dr. Michelle Johnson , MD

Internal Medicine - Geriatric Medicine

NPI 1114285905

Doctor of Medicine (M.D.)

Career & Practice History

NPI enumerated February 09, 2006.

No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.

No reviews have been published yet. Leave a review.

NPI Administrative Meta

NPI Number: 1245203306
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: February 09, 2006
Last Update: November 21, 2011
Sole Proprietor: No

Other Pediatrics Specialists in Cambridge

Healthcare providers in Cambridge

Mailing Address

1493 Cambridge St

Cambridge, MA 021391047

Phone: 6176651616

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.