Kelly J Ocallahan, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

159560 Issued in MA

Practice address

100 Central St
Floor 4
Worcester, MA 01608-1209

Phone

(508) 831-0708

Fax

(508) 831-0272

NPI assigned

Jul 12, 2005

Sex

Female

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

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

Gastroenterology

Education

University of Massachusetts Medical School, 1993

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

New England Gastroenterology Associates, PCGroup PAC ID 5698665388, 3 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• St Vincent Hospital Hospital, Worcester, MA, CCN 220176
• Umass Memorial Medical Center/University Campus Hospital, Worcester, MA, CCN 220163
• Umass Memorial Health - Harrington Hospital Hospital, Southbridge, MA, CCN 220019

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://fhir4.healow.com/fhir/r4/HHBBAA/Endpoint/HHBBAA

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.

• New England Gastroenterology Associates, PC

  • Gastroenterology Physician
  • Worcester, MA
  • NPI 1497753958
  Medicare reassignment Care Compare group NPD

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

• Umass Memorial Health-Harrington Hospital Inc

  • General Acute Care Hospital
  • Southbridge, MA
  • NPI 1790780047
  Care Compare affiliation
• Umass Memorial Medical Center, Inc.

  • General Acute Care Hospital
  • Worcester, MA
  • NPI 1831151455
  Care Compare affiliation
• VHS Acquisition Subsidiary Number 7 Inc

  dba Saint Vincent Hospital

  • General Acute Care Hospital
  • Worcester, MA
  • NPI 1538131214
  Care Compare affiliation

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

{
    "created_epoch": "1121126400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1427056795",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "100 CENTRAL ST",
            "address_2": "FLOOR 4",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016081209",
            "telephone_number": "508-831-0708",
            "fax_number": "508-831-0272"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 CENTRAL ST",
            "address_2": "FLOOR 4",
            "city": "WORCESTER",
            "state": "MA",
            "postal_code": "016081209",
            "telephone_number": "508-831-0708",
            "fax_number": "508-831-0272"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OCALLAHAN",
        "first_name": "KELLY",
        "middle_name": "J",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2005-07-12",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MA",
            "license": "159560",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3201601",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Chinasa Obijiaku, PMHNP-BC
• Ezinne Obijiaku
• Owen Travis Oboite
• Julia Obrycki
• Oc Azure of Worcester Center LLC
• Yanira Ocasio
• Occhiali Eyewear Boutique
• Mohamad R. Och, M.D.
• Jonathan M. Ochab, DMD
• Gabriel J Ochoa, GENERAL DENTISTRY

• Gastroenterology Physician in Worcester, MA
• Providers in Worcester, MA by specialty
• Gastroenterology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.