Marianne Siebert, PA-C

Primary specialty

Physician AssistantTaxonomy code 363A00000X

License

PA10700 Issued in TX

Practice address

621 N Hall St
Suite 400
Dallas, TX 75226-1339

Phone

(469) 800-7400

NPI assigned

Aug 2, 2016

Sex

Female

Sole proprietor

Yes

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 TX

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, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Healthtexas Provider NetworkGroup PAC ID 1355254210, 2,535 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Baylor University Medical Center Hospital, Dallas, TX, CCN 450021

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

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.

• Healthtexas Provider Network

  • Family Medicine Physician
  • Dallas, TX
  • NPI 1760488936
  Medicare reassignment Care Compare group
• Questcare Hospitalists PLLC

  • Emergency Medicine Physician
  • Dallas, TX
  • NPI 1265441620

  Physician Assistant

  Medicare reassignment NPD
• Healthtexas Provider Network

  • Anesthesiology Physician
  • Lakeway, TX
  • NPI 1104714583
  NPD
• Healthtexas Provider Network

  • Family Medicine Physician
  • Plano, TX
  • NPI 1003811639
  NPD (past)

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

• Baylor University Medical Center

  • General Acute Care Hospital
  • Dallas, TX
  • NPI 1447250253
  Care Compare affiliation

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

{
    "created_epoch": "1470096000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772409600000",
    "number": "1750834164",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "621 N HALL ST",
            "address_2": "SUITE 400",
            "city": "DALLAS",
            "state": "TX",
            "postal_code": "752261339",
            "telephone_number": "469-800-7400"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "621 N HALL ST",
            "address_2": "SUITE 400",
            "city": "DALLAS",
            "state": "TX",
            "postal_code": "752261339",
            "telephone_number": "469-800-7400"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIEBERT",
        "first_name": "MARIANNE",
        "credential": "PA-C",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2016-08-02",
        "last_updated": "2026-03-02",
        "certification_date": "2026-03-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "TX",
            "license": "PA10700",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mseibert228207@direct.sw.org",
            "affiliation": "N",
            "address_1": "621 N Hall St",
            "address_2": "Suite 400",
            "city": "Dallas",
            "state": "TX",
            "country_code": "US",
            "postal_code": "752261339",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Sidney a. Kelt Jr., M.D., P.a.
• Ashley Sidney
• Sidog Ventures
• Siebel Diagnostic Laboratories
• Marsha Siebenmorgen, PHD, LP
• Kenneth Steven Siedler, PSY.D., M.A.
• Beth Siegan
• Jane Doris Siegel, MD
• Jeffrey Siegel, M.D.
• Jeffrey Craig Siegel, PH.D.

• Physician Assistant in Dallas, TX
• Providers in Dallas, TX by specialty
• Physician Assistant in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 2, 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.