Individual provider Active NPI

Michael G Fitzsimons, MD

  • Anesthesiology Physician
  • Boston, MA
National Provider Identifier
1588632848
Registry record updated Sep 16, 2014
On this page

Key facts

NPPES NPI Registry
Primary specialty
Anesthesiology PhysicianTaxonomy code 207L00000X
License
206890 Issued in MA
Practice address
55 Fruit Street
GRB 406E
Boston, MA 02114-2696
Phone
(617) 726-8808
NPI assigned
Mar 10, 2006
Last updated
Sep 16, 2014By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Sep 16, 2014

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Anesthesiology Physician 207L00000X 206890 MA Primary
Critical Care Medicine (Anesthesiology) Physician 207LC0200X 206890 MA

Addresses

Primary practice location

55 Fruit Street
GRB 406E
Boston, MA 02114-2696

Mailing address

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

Other identifiers 3

IdentifierTypeStateIssuer
0114961MedicaidMA
206890OtherMATUFTS HEALTH PLAN
J22836OtherMABCBS MA

Medicare participation

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

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20110304000458 MA Practitioner - Critical Care (Intensivists)Practitioner - Anesthesiology 6103008636 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Critical Care (Intensivists)Also: Anesthesiology
Education
Other, 1993
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices

Practice addresses (Care Compare)

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

75 Francis St
Boston, MA 02115-6110
Phone (617) 732-5500

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
206890MAMDCritical Care Medicine (Anesthesiology) Physician

Practice roles

OrganizationSpecialtyStatusNew patients
The General Hospital Corporation CurrentSince Oct 1, 2006 Accepting new patients
Brigham & Womens Physicians Organization Inc Anesthesiology CurrentSince Aug 6, 2025 Accepting new patients
General Hospital Corp Current Accepting new patients
Massachusetts General Physicians Organization Inc Critical Care Medicine CurrentSince Sep 26, 2000 Accepting new patients

Locations

55 Fruit St
Boston, MA 02114

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

55 Fruit St
#406E
Boston, MA 02114
Phone (617) 724-7181

75 Francis St
Boston, MA 02115

1153 Centre St
Jamaica Plain, MA 02130
Phone (617) 983-7000

Interoperability endpoints

  • Direct secure messaging: fitzsimons.michael.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 2

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": "1141948800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1410825600000",
    "number": "1588632848",
    "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": "55 FRUIT STREET",
            "address_2": "GRB 406E",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142696",
            "telephone_number": "617-726-8808"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FITZSIMONS",
        "first_name": "MICHAEL",
        "middle_name": "G",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-03-10",
        "last_updated": "2014-09-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "MA",
            "license": "206890",
            "primary": true
        },
        {
            "code": "207LC0200X",
            "taxonomy_group": "",
            "desc": "Anesthesiology, Critical Care Medicine",
            "state": "MA",
            "license": "206890",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0114961",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TUFTS HEALTH PLAN",
            "identifier": "206890",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS MA",
            "identifier": "J22836",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Boston, MA

Sources for this page

Verify at the official NPI Registry.