Alexandra Hallagan, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

2025028073 Issued in MO

Practice address

10010 Kennerly Rd
Saint Louis, MO 63128-2106

Phone

(314) 525-1906

Fax

(314) 525-4148

NPI assigned

Apr 19, 2021

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

Medicare fee-for-service enrollment

Enrolled in TX, MO2 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

Emergency Medicine

Education

Ohio State University College of Medicine, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Mercy Hospital SouthGroup PAC ID 8426962556, 45 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercy Hospital South Hospital, Saint Louis, MO, CCN 260077

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ahallagan232718@direct.valleywisehealth.org

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.

• Mercy Hospital South

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1568481984

  Emergency Medicine

  Medicare reassignment Care Compare group NPD
• San Carlos Apache Healthcare Corporation

  • Critical Access Hospital Clinic/Center
  • Peridot, AZ
  • NPI 1265813075

  TX

  Medicare reassignment NPD
• Mercy Hospital South

  • Medicare Defined Swing Bed Hospital Unit
  • Saint Louis, MO
  • NPI 1033714209
  NPD
• District Medical Group, Inc

  • Anatomic Pathology & Clinical Pathology Physician
  • Phoenix, AZ
  • NPI 1336472448
  NPD
• San Carlos Apache Healthcare Corporation

  • Clinic/Center
  • Bylas, AZ
  • NPI 1417330713
  NPD

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

• Mercy Hospital South

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1568481984
  Care Compare affiliation

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

{
    "created_epoch": "1618790400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761868800000",
    "number": "1669053898",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "10010 KENNERLY RD",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631282106",
            "telephone_number": "314-525-1906",
            "fax_number": "314-525-4148"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10010 KENNERLY RD",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631282106",
            "telephone_number": "314-525-1906",
            "fax_number": "314-525-4148"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HALLAGAN",
        "first_name": "ALEXANDRA",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2021-04-19",
        "last_updated": "2025-10-31",
        "certification_date": "2025-10-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MO",
            "license": "2025028073",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Shantiela Hall
• Susan Mary Hall, M.ED
• Tiffany Danielle Hall
• Trevor W Hall, PHARMD
• Yoshiko Hall, PSY.D.
• Dennis E Hallahan, MD
• Kaitlin Hallahan, DO
• Mary Grace Hallare, RD
• Anna M Halldorsdottir, M.D.
• Chase Hallemann, C-AA

• Emergency Medicine Physician in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Emergency Medicine Physician in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 31, 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.