NPIMap

Individual provider Active NPI

John Chiosi, M.D.

  • Infectious Disease Physician
  • Boston, MA
National Provider Identifier
1306231097
Registry record updated Jun 1, 2023
On this page

Key facts

NPPES NPI Registry
Primary specialty
Infectious Disease PhysicianTaxonomy code 207RI0200X
License
279009 Issued in MA
Practice address
55 Fruit St.
Cox 5
Boston, MA 02114
Phone
(617) 726-3906
Fax
(617) 726-7653
NPI assigned
Mar 31, 2015
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jun 1, 2023

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Infectious Disease Physician 207RI0200X 279009 MA Primary

Addresses

Primary practice location

55 Fruit St.
Cox 5
Boston, MA 02114

Mailing address

55 Fruit St.
Cox-5
Boston, MA 02114

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
I20210721003052 MA Practitioner - Infectious Disease 6103106299 Reassigns benefits to 7 organizations

Care Compare profile

Medicare Care Compare
Specialty
Infectious Disease
Education
Icahn School of Medicine at Mount Sinai, 2015
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
New England Baptist Medical Associates, Inc.Group PAC ID 2365439783, 77 clinicians
The General Hospital CorporationGroup PAC ID 6507803806, 1,275 clinicians

Practice addresses (Care Compare)

10 Denniston PL
Womens Health
Northampton, MA 01060-2052
Phone (413) 586-9866

125 Parker Hill Ave
Boston, MA 02120-2847
Phone (617) 754-5800

2014 Washington St
Newton, MA 02462-1607
Phone (617) 243-6000

30 Locust St
Northampton, MA 01060-2052
Phone (413) 582-2441

55 Fruit St
Boston, MA 02114-2621
Phone (617) 726-2000

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
279009MAMDInfectious Disease Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Mass General Brigham Medical Group Suburban Massachusetts Inc Infectious Disease CurrentSince Aug 26, 2025 Accepting new patients
Mass General Brigham Medical Group Western Massachusetts Inc Infectious Disease CurrentSince Sep 15, 2025 Accepting new patients
The General Hospital Corporation CurrentSince Jul 1, 2021 Accepting new patients
Massachusetts General Physicians Organization Inc CurrentSince Jul 1, 2021 Accepting new patients
Nantucket Cottage Hospital CurrentSince Aug 24, 2024 Accepting new patients
Nantucket Physicians Organization CurrentSince Sep 23, 2024 Accepting new patients
General Hospital Corp Current Accepting new patients
Nantucket Cottage Hospital Current Accepting new patients

Locations

55 Fruit St
#504
Boston, MA 02114
Phone (617) 724-7511

55 Fruit St
#5
Boston, MA 02114
Phone (617) 724-6750

55 Fruit St
Boston, MA 02114

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

57 Prospect St
Nantucket, MA 02554
Phone (508) 228-1200

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: chiosi.john.mgh@direct.partners.masshiway.net

Organizations & group practices 9

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

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": "1427760000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1685577600000",
    "number": "1306231097",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST.",
            "address_2": "COX-5",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02114"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST.",
            "address_2": "COX 5",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02114",
            "telephone_number": "617-726-3906",
            "fax_number": "617-726-7653"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHIOSI",
        "first_name": "JOHN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-03-31",
        "last_updated": "2023-06-01",
        "certification_date": "2023-06-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RI0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Infectious Disease",
            "state": "MA",
            "license": "279009",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Boston, MA

Sources for this page

Verify at the official NPI Registry.