HEIDI UNDERWOOD CRNA
NPI 1497174593
Nurse Anesthetist, Certified Registered in Sioux Falls, SD
About Heidi Underwood Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HEIDI UNDERWOOD CRNA (NPI 1497174593) is an individual nurse anesthetist, certified registered in Sioux Falls, South Dakota, licensed in South Dakota (CR000839) and active in the NPI registry since April 2014. She is affiliated with Trinity Hospitals, maintains a secondary practice location in Minot, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Heidi Underwood Crna is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Heidi Underwood reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sioux Falls, SD 57105
- Reassigned Medicare billing, South Dakota enrollment
- 39 clinicians in this Medicare group
Sioux Falls, SD 57105
- Reassigned Medicare billing, South Dakota enrollment
- 1,097 clinicians in this Medicare group
Sioux Falls, SD 57105
- Reassigned Medicare billing, South Dakota enrollment
- 66 clinicians in this Medicare group
Sioux Falls, SD 57108
- Reassigned Medicare billing, South Dakota enrollment
- 24 clinicians in this Medicare group
Dakota Dunes, SD 57049
- Reassigned Medicare billing, South Dakota enrollment
- 62 clinicians in this Medicare group
Minot, ND 58701
- Reassigned Medicare billing, North Dakota enrollment
- 339 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Trinity Hospitals
Acute Care Hospitals · Minot, NDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57117 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Heidi Underwood's NPI number?
The NPI number for Heidi Underwood is 1497174593. It was assigned to this individual provider in the NPPES registry on April 16, 2014.
Where is Heidi Underwood located?
Heidi Underwood practices at 1305 W. 18th Street, Sioux Falls, SD 57117. The listed phone number is (605) 328-6548.
What is Heidi Underwood's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Heidi Underwood enrolled in Medicare?
Yes. Heidi Underwood is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Heidi Underwood's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Heidi Underwood reassigns Medicare benefits to 6 organizations: Anesthesiology Associates, Inc. (Sioux Falls, SD), Sanford Medical Center (Sioux Falls, SD), Sioux Falls Specialty Hospital, LLP (Sioux Falls, SD), Ophthalmology Ltd Eye Surgery Center L L C (Sioux Falls, SD), Siouxland Anesthesiology, Ltd (Dakota Dunes, SD) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Heidi Underwood's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Heidi Underwood accept?
Health plans from Blue Cross Blue Shield of North Dakota, Oscar Insurance Company, Wellmark Health Plan of Iowa, Inc. and Wellmark of South Dakota, Inc. list Heidi Underwood as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Heidi Underwood affiliated with any hospitals?
According to CMS data, Heidi Underwood is affiliated with Trinity Hospitals.
When was this NPI record last updated?
The NPPES record for Heidi Underwood was last updated on September 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Heidi Underwood, CRNA · NPI 1497174593
Nurse Anesthetist, Certified Registered physician in Sioux Falls, South Dakota. Individual provider, active in the CMS NPPES registry since April 16, 2014.
## Identity
- **NPI:** 1497174593 (Entity type: Individual)
- **Enumerated:** April 16, 2014
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** CR000839 (South Dakota)
- **Sole proprietor:** No
## Practice location
- **Address:** 1305 W. 18TH STREET, Sioux Falls, SD 57117-5074
- **Phone:** (605) 328-6548
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Anesthesiology Associates, Inc. (NPI 1477622215, Sioux Falls, SD); Sanford Medical Center (NPI 1093090342, Sioux Falls, SD); Sioux Falls Specialty Hospital, LLP (NPI 1316946809, Sioux Falls, SD); Ophthalmology Ltd Eye Surgery Center L L C (NPI 1871581876, Sioux Falls, SD); Siouxland Anesthesiology, Ltd (NPI 1669496337, Dakota Dunes, SD); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** September 24, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1497174593) · Data from the CMS NPPES public registry.