Benjamin D. Hamar, MD

Primary specialty

Maternal & Fetal Medicine PhysicianTaxonomy code 207VM0101X

License

227040 Issued in MA

Practice address

119 Belmont St
Worcester, MA 01605-2903

Phone

(508) 334-0550

Fax

(508) 334-8412

NPI assigned

Nov 9, 2005

Last updated

Mar 6, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Electronic endpoints 2

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

Specialty

Obstetrics/Gynecology

Education

New York University School of Medicine, 1999

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Umass Memorial Medical Group IncGroup PAC ID 4284539891, 2,494 clinicians

Reliant Medical Group IncGroup PAC ID 5597755322, 638 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Umass Memorial Medical Center/University Campus Hospital, Worcester, MA, CCN 220163

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: benjamin.hamar.npi1003897877.reliant@direct.optumcare.masshiway.net
• Direct secure messaging: bhamar252543@direct.bmc.masshiway.net
• Direct secure messaging: bhamar283145@umassmemorial.direct-ci.com
• Direct secure messaging: bhamar99354@tuftsmedicine.direct-ci.com

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.

• Reliant Medical Group, Inc

  • Family Medicine Physician
  • Worcester, MA
  • NPI 1720017528
  Medicare reassignment Care Compare group NPD
• Umass Memorial Medical Group Inc

  • Internal Medicine Physician
  • Worcester, MA
  • NPI 1760445373
  Medicare reassignment Care Compare group NPD
• Beth Israel Deaconess Medical Center, Inc.

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1548202641
  Medicare reassignment NPD
• BMC Affiliated Physicians, Inc.

  • Internal Medicine Physician
  • Boston, MA
  • NPI 1245320910
  Medicare reassignment NPD
• Circle Health OBGYN, LLC.

  • Obstetrics & Gynecology Physician
  • North Chelmsford, MA
  • NPI 1912179870
  Medicare reassignment NPD
• Essex County OBGYN Assoc Inc

  • Obstetrics & Gynecology Physician
  • Beverly, MA
  • NPI 1538275870
  Medicare reassignment NPD
• LGH Medical Group, Inc.

  • Hospitalist Physician
  • Lowell, MA
  • NPI 1174698385
  Medicare reassignment NPD
• Obhg Massachusetts - Direct, P.C.

  • Obstetrics Physician
  • Brockton, MA
  • NPI 1487229035
  Medicare reassignment NPD
• Saint Vincent Physician Services, Inc.

  • Family Medicine Physician
  • Worcester, MA
  • NPI 1013997329
  Medicare reassignment NPD
• Steward Medical Group, Inc

  • Specialist
  • Watertown, MA
  • NPI 1629398219
  Medicare reassignment NPD
• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

  dba OB/GYN - HMFP at BIDMC

  • Obstetrics & Gynecology Physician
  • Boston, MA
  • NPI 1518908136
  Medicare reassignment
• Beth Israel Deaconess Medical Center, Inc.

  • Ambulance
  • Boston, MA
  • NPI 1518600501
  NPD

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

• Umass Memorial Medical Center, Inc.

  • General Acute Care Hospital
  • Worcester, MA
  • NPI 1831151455
  Care Compare affiliation

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

{
    "created_epoch": "1131494400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1741219200000",
    "number": "1003897877",
    "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": "119 BELMONT ST",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016052903",
            "telephone_number": "508-334-0550",
            "fax_number": "508-334-8412"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "736 Cambridge St",
            "address_purpose": "LOCATION",
            "city": "Brighton",
            "state": "MA",
            "postal_code": "02135",
            "country_code": "US",
            "telephone_number": "617-562-7050",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HAMAR",
        "first_name": "BENJAMIN",
        "middle_name": "D.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-09",
        "last_updated": "2025-03-06",
        "certification_date": "2025-03-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207VM0101X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology, Maternal & Fetal Medicine",
            "state": "MA",
            "license": "227040",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "110073416A",
            "state": "MA"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "bhamar283145@UmassMemorial.direct-ci.com",
            "affiliation": "N",
            "address_1": "119 Belmont St",
            "city": "Worcester",
            "state": "MA",
            "country_code": "US",
            "postal_code": "016052903",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://epicproxy.et0978.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "119 Belmont St",
            "city": "Worcester",
            "state": "MA",
            "country_code": "US",
            "postal_code": "016052903",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Michelle Halvorsen, NP
• Allan Shelby Ham, LCSW
• Charles D Hamad, PH.D.
• Maha Hamadi
• Barbara S Hamann, MSW
• Tatiana Anna Hamawi, M.D.
• Cherise Hamblin, M.D.
• Samir Hamdan, DC
• Asma A Hameed, D.M.D
• Alexander Paul Hamel

• Maternal & Fetal Medicine Physician in Worcester, MA
• Providers in Worcester, MA by specialty
• Maternal & Fetal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 6, 2025; 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.