NPIMap

Individual provider Active NPI

John Joseph McGrath III, MD

  • Radiation Oncology Physician
  • Concord, MA
National Provider Identifier
1215913157
Registry record updated Jul 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Radiation Oncology PhysicianTaxonomy code 2085R0001X
License
157106 Issued in MA
Practice address
Old Road to Nine Acre Corner
Emerson Hospital Radiation Medicine
Concord, MA 01742
Phone
(978) 287-3290
Fax
(978) 287-3295
NPI assigned
Dec 22, 2005
Last updated
Jul 13, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 13, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Radiation Oncology Physician 2085R0001X 157106 MA Primary

Addresses

Primary practice location

Old Road to Nine Acre Corner
Emerson Hospital Radiation Medicine
Concord, MA 01742

Mailing address

PO Box 9142
Mass General Physician Organization
Charlestown, MA 02129-9142
Phone (617) 724-0287

Other identifiers 3

IdentifierTypeStateIssuer
791236OtherMATUFTS HEALTH PLAN
3179508MedicaidMA
J18882OtherMABCBS MA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20040727001157 MA Practitioner - Radiation Oncology 4486624574 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Radiation Oncology
Education
University of Vermont College of Medicine, 1993
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices

Practice addresses (Care Compare)

102 Endicott St
MGH North Shore Medical
Danvers, MA 01923-3623
Phone (978) 882-6100

55 Fruit St
Boston, MA 02114-2696
Phone (617) 724-0287

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
157106MAMDRadiation Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
The General Hospital Corporation CurrentSince Oct 1, 2006 Accepting new patients
Mass General Brigham Medical Group Western Massachusetts Inc CurrentSince Mar 15, 2019 Accepting new patients
General Hospital Corp Current Accepting new patients
Massachusetts General Physicians Organization Inc CurrentSince Jun 12, 1998 Accepting new patients

Locations

55 Fruit St
Boston, MA 02114

55 Fruit St
#2
Boston, MA 02114
Phone (617) 726-2967

2014 Washington St
Newtonville, MA 02462
Phone (617) 243-6000

30 Locust St
Northampton, MA 01060
Phone (413) 582-2000

Interoperability endpoints

  • Direct secure messaging: mcgrath.john.mgh@direct.partners.masshiway.net

Organizations & group practices 4

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 5

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1135209600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1215913157",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 9142",
            "address_2": "MASS GENERAL PHYSICIAN ORGANIZATION",
            "city": "CHARLESTOWN",
            "state": "MA",
            "postal_code": "021299142",
            "telephone_number": "617-724-0287",
            "fax_number": "617-726-2894"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "OLD ROAD TO NINE ACRE CORNER",
            "address_2": "EMERSON HOSPITAL RADIATION MEDICINE",
            "city": "CONCORD",
            "state": "MA",
            "postal_code": "01742",
            "telephone_number": "978-287-3290",
            "fax_number": "978-287-3295"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MCGRATH",
        "first_name": "JOHN",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "name_suffix": "III",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-12-22",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "MA",
            "license": "157106",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TUFTS HEALTH PLAN",
            "identifier": "791236",
            "state": "MA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3179508",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS MA",
            "identifier": "J18882",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Concord, MA

Sources for this page

Verify at the official NPI Registry.