NICHOLAS THOMAS THIELEN MD
NPI 1326627902
Hospitalist in Sioux Falls, SD
About Nicholas Thomas Thielen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS THOMAS THIELEN MD (NPI 1326627902) is an individual hospitalist provider in Sioux Falls, South Dakota, licensed in South Dakota (15504) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS, is affiliated with Sanford Sheldon Medical Center, and maintains a secondary practice location in Sioux Falls.
NPPES Registry Identity
Specialties & Licenses 3
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
Nicholas Thomas Thielen Md 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 Reassignment
Medicare enrollment records show Nicholas Thielen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Sioux Falls, SD 57105
- Reassigned Medicare billing, South Dakota enrollment
- 826 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 3
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sanford Sheldon Medical Center
Critical Access Hospitals · Sheldon, IASanford Usd Medical Center
Acute Care Hospitals · Sioux Falls, SDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57105 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SIOUX FALLS, SD 57105
SIOUX FALLS, SD 57105
SIOUX FALLS, SD 57105
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 Nicholas Thielen's NPI number?
The NPI number for Nicholas Thielen is 1326627902. It was assigned to this individual provider in the NPPES registry on April 2, 2021.
Where is Nicholas Thielen located?
Nicholas Thielen practices at 1305 W 18th St, Sioux Falls, SD 57105. The listed phone number is (605) 328-4973.
What is Nicholas Thielen's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Nicholas Thielen enrolled in Medicare?
Yes. Nicholas Thielen 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 organization bills Medicare for Nicholas Thielen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Thielen reassigns Medicare benefits to Sanford Clinic (Sioux Falls, SD). The 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 Nicholas Thielen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Thielen accept?
Health plans from Wellmark Health Plan of Iowa, Inc. and Wellmark of South Dakota, Inc. list Nicholas Thielen 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 Nicholas Thielen affiliated with any hospitals?
According to CMS data, Nicholas Thielen is affiliated with Sanford Sheldon Medical Center and Sanford Usd Medical Center.
When was this NPI record last updated?
The NPPES record for Nicholas Thielen was last updated on December 11, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.
# Nicholas Thomas Thielen, MD · NPI 1326627902
Hospitalist physician in Sioux Falls, South Dakota. Individual provider, active in the CMS NPPES registry since April 2, 2021.
## Identity
- **NPI:** 1326627902 (Entity type: Individual)
- **Enumerated:** April 2, 2021
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 15504 (South Dakota)
- **Sole proprietor:** No
## Practice location
- **Address:** 1305 W 18TH ST, Sioux Falls, SD 57105-0401
- **Phone:** (605) 328-4973
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Sanford Clinic (NPI 1043583537, Sioux Falls, SD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** December 11, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1326627902) · Data from the CMS NPPES public registry.