Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Matthew D Christiansen, PHD

Clinical Psychologist in Mitchell, SD · enumerated 2006.

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

National Provider Identifier

1639136088

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Matthew D Christiansen

Credential PHD

Sex Male

Practice address 115 E Havens Ave Ste 102, Mitchell, SD, 57301

Phone (605) 299-2829

Enumeration date Apr 28, 2006

Last updated in NPPES Sep 8, 2024

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 488 (SD) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
SD449	Other	SD	DAKOTACARE
33171	Other	SD	SIOUX VALLEY HEALTH
91400318	Medicaid	SD	-
9189	Other	SD	AVERA HEALTH
4995782	Other	SD	WELLMARK BC BS

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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Matthew Christiansen's NPI record?

Cross-check NPI 1639136088 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1639136088 active?

Yes, as of the latest NPPES snapshot, NPI 1639136088 is active (record last updated 2024-09-08).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-08.