Haydan Elizabeth Ommen, PA

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

2024006376 Issued in MO

Practice address

14825 N Outer 40 Rd Ste 200
Chesterfield, MO 63017-2152

Phone

(314) 336-2555

NPI assigned

Mar 26, 2024

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, 2023

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Mercy Clinic Surgical Specialists LLCGroup PAC ID 1153455076, 180 clinicians

Orthopedic Center of St Louis Img LLCGroup PAC ID 5698213221, 6 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

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

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

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 Clinic Surgical Specialists, LLC

  • Vascular Surgery Physician
  • Washington, MO
  • NPI 1043530538
  Medicare reassignment Care Compare group
• Orthopedic Center of St Louis Img LLC

  • Orthopaedic Surgery Physician
  • Chesterfield, MO
  • NPI 1649041666
  Medicare reassignment Care Compare group
• Mercy Clinic East Communities

  • Internal Medicine Physician
  • Saint Louis, MO
  • NPI 1851335228
  NPD (past)

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": "1711411200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771804800000",
    "number": "1699525121",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "12700 SOUTHFORK RD STE 100",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631283201",
            "telephone_number": "314-543-5284"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "14825 N OUTER 40 RD STE 200",
            "city": "CHESTERFIELD",
            "state": "MO",
            "postal_code": "630172152",
            "telephone_number": "314-336-2555"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OMMEN",
        "first_name": "HAYDAN",
        "middle_name": "ELIZABETH",
        "name_prefix": "Ms.",
        "credential": "PA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-03-26",
        "last_updated": "2026-02-23",
        "certification_date": "2026-02-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "MO",
            "license": "2024006376",
            "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 Anesthesiology",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631101003",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Audrey Louise Olsen, DO
• Jessica Olsen, LCSW
• Joyce Lynn Olshan, OTR
• Om Vision Services Inc,
• Gary Omell, M.D.
• Open Heart Anesthesiology, LLC
• Oral Med Center Inc
• Oral Surgery Associates PC
• Caitlyn Nicole Orawiec, OT
• Orchard Learning & Behavior Services

• 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 Feb 23, 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.