Mark J Brenner, MD

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

54099 Issued in MA

Practice address

1 Eaton PL Ste 100
Worcester, MA 01608

Phone

(508) 363-6881

Fax

(508) 363-7170

NPI assigned

Mar 2, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 4

Medicare fee-for-service enrollment

Enrolled in MA, WI2 enrollments

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 2

Specialty

Radiation Oncology

Education

Tufts University School of Medicine, 1981

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Saint Vincent Physician Services IncGroup PAC ID 8921056276, 71 clinicians

The Monroe Clinic, Inc.Group PAC ID 3072425495, 199 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• St Vincent Hospital Hospital, Worcester, MA, CCN 220176
• The Monroe Clinic Hospital, Monroe, WI, CCN 520028

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• Saint Vincent Physician Services, Inc.

  • Family Medicine Physician
  • Worcester, MA
  • NPI 1013997329
  Medicare reassignment Care Compare group NPD
• The Monroe Clinic, Inc.

  • Specialist
  • Monroe, WI
  • NPI 1386720548
  Medicare reassignment Care Compare group NPD
• Umass Memorial Medical Group Inc

  • Internal Medicine Physician
  • Worcester, MA
  • NPI 1760445373
  Medicare reassignment
• Radiation Oncology Services of Northwest Baltimore, LLC

  • Radiation Oncology Physician
  • Baltimore, MD
  • NPI 1043274905
  NPD (past) Authorized official
• The Monroe Clinic, Inc.

  • General Acute Care Hospital
  • Monroe, WI
  • NPI 1740291491
  NPD
• VHM Services, Inc.

  • Internal Medicine Physician
  • Framingham, MA
  • NPI 1508818618
  NPD (past)
• American Radiology Associates, P.a.

  • Diagnostic Radiology Physician
  • Prince Frederick, MD
  • NPI 1629235312
  NPD (past)
• Northwest Baltimore Radiation Therapy Regional Center, LLC

  • Radiation Oncology Physician
  • Owings Mills, MD
  • NPI 1639145279
  NPD (past)

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

• VHS Acquisition Subsidiary Number 7 Inc

  • General Acute Care Hospital
  • Worcester, MA
  • NPI 1538131214
  Care Compare affiliation
• The Monroe Clinic, Inc.

  • General Acute Care Hospital
  • Monroe, WI
  • NPI 1740291491
  Care Compare affiliation

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

{
    "created_epoch": "1141257600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779753600000",
    "number": "1902873409",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 415348",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "022415348",
            "telephone_number": "800-225-8885",
            "fax_number": "508-334-1977"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 EATON PL STE 100",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "01608",
            "telephone_number": "508-363-6881",
            "fax_number": "508-363-7170"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "20 Washington Sq",
            "address_purpose": "LOCATION",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016044013",
            "country_code": "US",
            "telephone_number": "508-363-6218",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "275 Nichols Rd",
            "address_purpose": "LOCATION",
            "city": "Fitchburg",
            "state": "MA",
            "postal_code": "014201919",
            "country_code": "US",
            "telephone_number": "978-343-5151",
            "fax_number": "774-442-5006",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BRENNER",
        "first_name": "MARK",
        "middle_name": "J",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-02",
        "last_updated": "2026-05-26",
        "certification_date": "2026-05-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "MA",
            "license": "54099",
            "primary": true
        },
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "MD",
            "license": "D0041640",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "110085074A",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "920007556",
            "state": "MD"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "168741700",
            "state": "MD"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RR MEDICARE",
            "identifier": "920004528",
            "state": "MD"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Julia Brem
• Jennifer Kerina Brennan, LICSW
• Kayla Brennan
• Kimberly A. Brennan, PA-C
• Patrick B. Brennan, CRNA
• Maxine S Brenner, RN LMHC
• Alexis K Brenya, MD
• Joyce Brescia
• Jamee Bresee, PA-C
• James P Bresnahan Jr., LMFT LMHC LADAC1 CAD

• Diagnostic Radiology Physician in Worcester, MA
• Providers in Worcester, MA by specialty
• Diagnostic Radiology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 26, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.