Heidi Underwood, CRNA

Primary specialty

Certified Registered Nurse AnesthetistTaxonomy code 367500000X

License

CR000839 Issued in SD

Practice address

1305 W. 18TH Street
Sioux Falls, SD 57117-5074

Phone

(605) 328-6548

NPI assigned

Apr 16, 2014

Last updated

Sep 24, 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 2

Addresses

Electronic endpoints 2

Medicare fee-for-service enrollment

Enrolled in SD, ND2 enrollments

Enrollment records 2

Specialty

Certified Registered Nurse Anesthetist (Crna)

Education

Other, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Trinity HealthGroup PAC ID 7911816020, 292 clinicians

Sioux Falls Specialty Hospital, LLPGroup PAC ID 3173510898, 53 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Trinity Hospitals Hospital, Minot, ND, CCN 350006

Medicare enrollment (NPD)

Enrolled

Credentials

Certified Registered Nurse

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: hunderwood1139316@direct.sanfordhealth.org

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.

• Sioux Falls Specialty Hospital, LLP

  • Special Hospital
  • Sioux Falls, SD
  • NPI 1316946809
  Medicare reassignment Care Compare group NPD
• Trinity Health

  dba Trinity Medical Group

  • Multi-Specialty Clinic/Center
  • Minot, ND
  • NPI 1083653752
  Medicare reassignment Care Compare group NPD
• Anesthesiology Associates, Inc.

  • Specialist
  • Sioux Falls, SD
  • NPI 1477622215
  Medicare reassignment NPD
• Ophthalmology LTD Eye Surgery Center L L C

  • Ambulatory Surgical Clinic/Center
  • Sioux Falls, SD
  • NPI 1871581876
  Medicare reassignment NPD
• Sanford Medical Center

  dba Edith Sanford Breast Specialty Clinic

  • Family Medicine Physician
  • Sioux Falls, SD
  • NPI 1093090342
  Medicare reassignment NPD
• Siouxland Anesthesiology, LTD

  • Pain Medicine (Anesthesiology) Physician
  • Dakota Dunes, SD
  • NPI 1669496337

  Nurse Anesthetist, Certified Registered

  Medicare reassignment NPD
• Sanford Medical Center

  dba Sanford USD Medical Center

  • General Acute Care Hospital
  • Sioux Falls, SD
  • NPI 1821017880
  NPD
• Sioux Falls Specialty Hospital, LLP

  dba Sioux Falls Urgent Care

  • Primary Care Clinic/Center
  • Sioux Falls, SD
  • NPI 1447780796
  NPD
• Trinity Health

  dba Trinity Oral & Facial Surgery Center

  • Oral and Maxillofacial Surgery Clinic/Center
  • Minot, ND
  • NPI 1245272277
  NPD
• Trinity Health

  dba Trinity Portable X-Ray

  • Portable X-ray and/or Other Portable Diagnostic Imaging Supplier
  • Minot, ND
  • NPI 1629636204
  NPD
• Pax PLLC

  • Multi-Specialty Clinic/Center
  • Sioux Falls, SD
  • NPI 1275353237
  NPD (past)

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

• Trinity Hospitals

  dba Trinity Health First Response Air Ambulance

  • Air Ambulance
  • Minot, ND
  • NPI 1053502773

  Hospital

  Care Compare affiliation
• Trinity Hospitals

  dba Community Ambulance Service, Inc.

  • Land Ambulance
  • Minot, ND
  • NPI 1134310857

  Hospital

  Care Compare affiliation
• Trinity Hospitals

  • General Acute Care Hospital
  • Minot, ND
  • NPI 1427103910
  Care Compare affiliation
• Trinity Hospitals

  dba Trinity Hospitals Residential Treatment Center

  • Substance Abuse Rehabilitation Facility
  • Minot, ND
  • NPI 1457539660

  Hospital

  Care Compare affiliation
• Trinity Hospitals

  dba Trinity St Joseph's CDU

  • Substance Use Disorder Rehabilitation Hospital Unit
  • Minot, ND
  • NPI 1487804092
  Care Compare affiliation
• Trinity Hospitals

  • General Acute Care Hospital
  • Minot, ND
  • NPI 1932359544
  Care Compare affiliation

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

{
    "created_epoch": "1397606400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758672000000",
    "number": "1497174593",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1305 W 18TH STREET",
            "address_2": "PO BOX 5074",
            "city": "SIOUX FALLS",
            "state": "SD",
            "postal_code": "571175074"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1305 W. 18TH STREET",
            "city": "SIOUX FALLS",
            "state": "SD",
            "postal_code": "571175074",
            "telephone_number": "605-328-6548"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2305 37th Ave SW",
            "address_purpose": "LOCATION",
            "city": "Minot",
            "state": "ND",
            "postal_code": "587017669",
            "country_code": "US",
            "telephone_number": "701-857-5000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "UNDERWOOD",
        "first_name": "HEIDI",
        "credential": "CRNA",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2014-04-16",
        "last_updated": "2025-09-24",
        "certification_date": "2025-09-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "367500000X",
            "taxonomy_group": "",
            "desc": "Nurse Anesthetist, Certified Registered",
            "state": "SD",
            "license": "CR000839",
            "primary": true
        },
        {
            "code": "367500000X",
            "taxonomy_group": "",
            "desc": "Nurse Anesthetist, Certified Registered",
            "state": "ND",
            "license": "R48418",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "hunderwood1139316@direct.sanfordhealth.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "1305 W. 18th Street",
            "city": "Sioux Falls",
            "state": "SD",
            "country_code": "US",
            "postal_code": "571175074",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "CONNECT",
            "endpointTypeDescription": "CONNECT URL",
            "endpoint": "https://cobiusconnect.cobius.com:8291/Gateway/DocumentSubmission/2_0/NhinService/XDRRequest_Service",
            "affiliation": "Y",
            "endpointDescription": "2.16.840.1.113883.3.1068.1",
            "affiliationName": "Cobius Healthcare Solutions",
            "use": "OTHER",
            "useDescription": "Other",
            "useOtherDescription": "CMS esMD eMDR",
            "address_1": "2720 Dundee Rd # 302",
            "city": "Northbrook",
            "state": "IL",
            "country_code": "US",
            "postal_code": "600622609",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• David Ray Ulmer, PT, MHS, OCS
• Matthew Robison Ulrich, MD
• Haddaya Umar, MD
• Brandi Marie Umberger, CSW
• Else Umbreit, PHARMD
• Keung Ung, M.D.
• Union Gospel Mission
• United Seating and Mobility LLC (Numotion)
• Universal Nursing Services, LTD (Family First Homecare of South Dakota)
• University of South Dakota Dental Hygiene

• Certified Registered Nurse Anesthetist in Sioux Falls, SD
• Providers in Sioux Falls, SD by specialty
• Certified Registered Nurse Anesthetist in South Dakota

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 24, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• 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.