Theron O'Halloran, MD

Primary specialty

Obstetrics & Gynecology PhysicianTaxonomy code 207V00000X

License

D0100658 Issued in MD

Practice address

301 Hospital Dr
Glen Burnie, MD 21061-5803

Phone

(410) 787-4000

NPI assigned

Apr 1, 2020

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

Medicare fee-for-service enrollment

Enrolled in MD

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

Western Michigan Un Homer Stryker School of Med, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

University of Maryland Community Medical Group IncGroup PAC ID 3678472214, 446 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• University of MD Baltimore Washington Medical Center Hospital, Glen Burnie, MD, CCN 210043

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: tohalloran1096913@direct.umm.edu

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.

• University of Maryland Community Medical Group, Inc.

  • Family Medicine Physician
  • Baltimore, MD
  • NPI 1477530624
  Medicare reassignment Care Compare group NPD
• University of Maryland Community Medical Group, Inc.

  • Psychiatry Physician
  • La Plata, MD
  • NPI 1679393854
  NPD
• Baltimore Washington Medical Center Inc.

  • General Acute Care Hospital
  • Glen Burnie, MD
  • NPI 1124016696
  NPD (past)

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

• Baltimore Washington Medical Center Inc.

  • General Acute Care Hospital
  • Glen Burnie, MD
  • NPI 1124016696
  Care Compare affiliation

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

{
    "created_epoch": "1585699200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758585600000",
    "number": "1093344145",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2001 MEDICAL PARKWAY",
            "city": "ANNAPOLIS",
            "state": "MD",
            "postal_code": "21401",
            "telephone_number": "443-481-1091",
            "fax_number": "443-924-2727"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "301 HOSPITAL DR",
            "city": "GLEN BURNIE",
            "state": "MD",
            "postal_code": "210615803",
            "telephone_number": "410-787-4000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'HALLORAN",
        "first_name": "THERON",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-04-01",
        "last_updated": "2025-09-23",
        "certification_date": "2025-09-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "MD",
            "license": "D0100658",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Thomas Nyabwa
• Martin Nkemamin Nzefeh
• Kathleen O'Connor Watson, RN, BSN, MS
• Laura Schultz O'Donovan, CRNP
• Terrence M O'Donovan, MD
• Ryan O'Leary
• Susan O'Malley, RD, LDN
• Michele K Oakley, DPT
• Linda Dianne Oaks, MD
• Oasis Kids Dental, LLC

• Obstetrics & Gynecology Physician in Glen Burnie, MD
• Providers in Glen Burnie, MD by specialty
• Obstetrics & Gynecology Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 23, 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.