Mallory Rose Holzer, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

2026005852 Issued in MO

Practice address

14532 S Outer 40 Rd
Dept Orthopaedic Surgery, Ste 200
Chesterfield, MO 63017-5705

Phone

(314) 514-3500

Fax

(314) 878-7678

NPI assigned

Jan 7, 2026

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

Saint Louis University School of Medicine, 2025

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Washington UniversityGroup PAC ID 9830008770, 2,968 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

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.

• Washington University

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1679516033
  Medicare reassignment Care Compare group NPD
• Washington University

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

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

{
    "created_epoch": "1767744000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1773705600000",
    "number": "1265399653",
    "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": "314-514-3500",
            "fax_number": "314-878-7678"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "14532 S OUTER 40 RD",
            "address_2": "DEPT ORTHOPAEDIC SURGERY, STE 200",
            "city": "CHESTERFIELD",
            "state": "MO",
            "postal_code": "630175705",
            "telephone_number": "314-514-3500",
            "fax_number": "314-878-7678"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOLZER",
        "first_name": "MALLORY",
        "middle_name": "ROSE",
        "name_prefix": "Ms.",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2026-01-07",
        "last_updated": "2026-03-17",
        "certification_date": "2026-01-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MO",
            "license": "2026005852",
            "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": "14532 S Outer 40 Rd",
            "address_2": "Dept Orthopaedic Surgery, Ste 200",
            "city": "Chesterfield",
            "state": "MO",
            "country_code": "US",
            "postal_code": "630175705",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Davis Eric Andre Holmes
• Michala L Holmes, SLP
• Rebekah Holobaugh, FNP
• Mary Holtmeier
• Peter Holtz, MD
• Home Hero Assisted Services LLC
• Home State Health Plan, Inc.
• Diane Hood, MD
• Hope Healthcare, LLC
• Hope Healthcare, LLC

• Physician Assistant in Chesterfield, MO
• Providers in Chesterfield, MO by specialty
• Physician Assistant in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 17, 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.