Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Thomas Allen Viereck, CNP
Nurse Practitioner in Yankton, SD · enumerated 2019.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1518526599
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Registry record
Entity type Individual (Type 1)
Name Thomas Allen Viereck
Credential CNP
Sex Male
Practice address 1104 W 8th St, Yankton, SD, 57078
Phone (605) 665-7841
Enumeration date Jun 12, 2019
Last updated in NPPES Jul 3, 2020
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License CP001582 (SD) Primary
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Thomas Viereck?
Thomas Viereck is registered in NPPES with the primary taxonomy of Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Susan Fanta Internal Medicine Physician · Yankton, SD NPI 1326049313 Tim Downing Medical Physician Assistant · Yankton, SD NPI 1790786788 Max Farver Hematology & Oncology Physician · Yankton, SD NPI 1548261548 Jay Hubner Internal Medicine Physician · Yankton, SD NPI 1700887627 Robert Ferrell Obstetrics & Gynecology Physician · Yankton, SD NPI 1790786796 Kevin Bray Obstetrics & Gynecology Physician · Yankton, SD NPI 1932100914 Randolph Heisinger Pediatrics Physician · Yankton, SD NPI 1023019049 Michael Mcvay Pediatrics Physician · Yankton, SD NPI 1750382636
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-07-03.