Alexandria Elizabeth Peterson, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

2023032439 Issued in MO

Practice address

1 Barnes Jewish Hospital PLZ
Dept Emergency Med
Saint Louis, MO 63110-1003

Phone

(314) 362-9123

Fax

(314) 362-0478

NPI assigned

May 20, 2022

Last updated

Nov 3, 2025By the provider in NPPES

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

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in MO

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Physician Assistant

Education

Other, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Washington UniversityGroup PAC ID 9830008770, 2,968 clinicians

Washington University Community Specialists LLCGroup PAC ID 8628588514, 94 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• SSM Health St Mary's Hospital - St Louis Hospital, Saint Louis, MO, CCN 260091
• Christian Hospital Northeast Hospital, Saint Louis, MO, CCN 260180

Merit-based Incentive Payment System (MIPS)

Final score

87.3 of 100Reported as group

Quality

70.94

Improvement activities

40

Cost

92.94

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: apeterson492415@direct-ehr-ssmhc.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.

• Washington University

  • Emergency Care Clinic/Center
  • Saint Louis, MO
  • NPI 1104866656
  Medicare reassignment Care Compare group NPD
• Washington University Community Specialists, LLC

  • Emergency Care Clinic/Center
  • Saint Louis, MO
  • NPI 1922812254
  Medicare reassignment Care Compare group NPD
• Mercy Hospital South

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1568481984
  Medicare reassignment NPD
• Cep America, LLC

  dba Vituity

  • Emergency Medicine Physician
  • Saint Louis, MO
  • NPI 1619332046
  Medicare reassignment
• Cep America LLC

  • Emergency Medicine Physician
  • Lake St Louis, MO
  • NPI 1982259305
  NPD
• Mercy Hospital South

  • Medicare Defined Swing Bed Hospital Unit
  • Saint Louis, MO
  • NPI 1033714209
  NPD
• Washington University

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1962442475
  NPD
• Cep America LLC

  • Emergency Medicine Physician
  • Fort Lauderdale, FL
  • NPI 1700747946
  NPD
• Cep America - California

  dba Vituity

  • Emergency Medicine Physician
  • Pomona, CA
  • NPI 1740235258
  NPD (past)

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

• Christian Hospital Northeast- Northwest

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1639186760
  Care Compare affiliation
• Christian Hospital Northeast-Northwest

  dba Christian Hospital

  • Ambulance
  • Saint Louis, MO
  • NPI 1073769329

  Hospital

  Care Compare affiliation
• SSM Health Care St. Louis

  dba SSM Health Cardinal Glennon Children's Hospital

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1336387836
  Care Compare affiliation
• SSM Health Care St. Louis

  dba SSM Health St. Mary's Hospital - St. Louis

  • General Acute Care Hospital
  • Saint Louis, MO
  • NPI 1962572396
  Care Compare affiliation

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

{
    "created_epoch": "1653004800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762128000000",
    "number": "1497493431",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 7412011",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606742011",
            "telephone_number": "314-362-9123",
            "fax_number": "314-362-0478"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1 BARNES JEWISH HOSPITAL PLZ",
            "address_2": "DEPT EMERGENCY MED",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631101003",
            "telephone_number": "314-362-9123",
            "fax_number": "314-362-0478"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "PETERSON",
        "first_name": "ALEXANDRIA",
        "middle_name": "ELIZABETH",
        "name_prefix": "Ms.",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2022-05-20",
        "last_updated": "2025-11-03",
        "certification_date": "2023-08-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MO",
            "license": "2023032439",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
            "affiliation": "Y",
            "affiliationName": "Washington University",
            "address_1": "1 Barnes Jewish Hospital Plz",
            "address_2": "Dept Emergency Med",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631101003",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Rebecca Jo Petersen, FNP
• Rebecca Y. Petersen, MD
• Robert Lynn Petersen, MD
• William C Petersen, PH.D.
• Danielle Lee Petersmith, CRNA
• Andrew Michael Peterson, MD
• Annahita Peterson, MD, MSCI
• Brian G Peterson, MD
• Casey Michelle Peterson, O.D.
• Chelsea Marie Peterson, DPT

• Physician Assistant in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Physician Assistant in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 3, 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.