Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Trevor Mark Wolterstorff

Psychologist in Sioux Falls, SD · enumerated 2019.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1639637689

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Registry record

Entity type Individual (Type 1)

Name Mr. Trevor Mark Wolterstorff

Sex Male

Practice address 7511 S Louise Ave, Sioux Falls, SD, 57108

Phone (605) 312-8700

Fax (757) 446-8401

Enumeration date Mar 8, 2019

Last updated in NPPES Feb 27, 2023

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 642 (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.

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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 Trevor Wolterstorff?

Trevor Wolterstorff is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-27.