NPIMap

Individual provider Active NPI

Mark Alexander Matza

  • Rheumatology Physician
  • Boston, MA
National Provider Identifier
1306264577
Registry record updated Apr 15, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Rheumatology PhysicianTaxonomy code 207RR0500X
License
278791 Issued in MA
Practice address
55 Fruit St
Boston, MA 02114-2696
Phone
(617) 726-7938
Fax
(617) 643-1274
NPI assigned
Apr 3, 2014
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Apr 15, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Rheumatology Physician 207RR0500X 278791 MA Primary

Addresses

Primary practice location

55 Fruit St
Boston, MA 02114-2696

Mailing address

55 Fruit St
Boston, MA 02114-2696
Phone (617) 726-7938

Other practice location 1

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

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
I20190618002908 MA Practitioner - RheumatologyPractitioner - Internal Medicine 7315211380 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
RheumatologyAlso: Internal Medicine
Education
Georgetown University School of Medicine, 2014
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
The General Hospital CorporationGroup PAC ID 6507803806, 1,275 clinicians

Practice addresses (Care Compare)

40 2ND Ave
Waltham, MA 02451-1132
Phone (781) 487-2900

50 Staniford St
Boston, MA 02114-2517

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

  • Massachusetts General Hospital Hospital, Boston, MA, CCN 220071
  • North Shore Medical Center - Hospital, Salem, MA, CCN 220035
  • Brigham and Women'S Hospital Hospital, Boston, MA, CCN 220110
  • Newton-Wellesley Hospital Hospital, Newton, MA, CCN 220101
  • Martha'S Vineyard Hospital Inc Hospital, Oak Bluffs, MA, CCN 221300

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
278791MAMDRheumatology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
General Hospital Corp Current Accepting new patients
The General Hospital Corporation CurrentSince Jul 1, 2019 Accepting new patients
Massachusetts General Physicians Organization Inc CurrentSince Jul 1, 2019 Accepting new patients

Locations

75 Francis St
Boston, MA 02115

55 Fruit St
Boston, MA 02114

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

Interoperability endpoints

  • Direct secure messaging: matza.mark.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 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": "1396483200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776211200000",
    "number": "1306264577",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142696",
            "telephone_number": "617-726-7938",
            "fax_number": "617-643-1274"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT ST",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142696",
            "telephone_number": "617-726-7938",
            "fax_number": "617-643-1274"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "75 Francis St",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "021156110",
            "country_code": "US",
            "telephone_number": "617-732-5500",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MATZA",
        "first_name": "MARK",
        "middle_name": "ALEXANDER",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2014-04-03",
        "last_updated": "2026-04-15",
        "certification_date": "2026-04-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "MA",
            "license": "278791",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Boston, MA

Sources for this page

Verify at the official NPI Registry.