NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Dewey J. Ertz, ED.D.

Psychologist in Rapid City, SD · enumerated 2007 · practices at Linda Holcomb,Msw, Inc.

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

National Provider Identifier

1164606570

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Dewey J. Ertz
Credential ED.D.
Sex Male
Practice address 3601 Canyon Lake Dr, Rapid City, SD, 57702
Phone (605) 341-8647
Fax (605) 341-0489
Enumeration date Dec 20, 2007
Last updated in NPPES Dec 20, 2007

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103T00000X Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Primary
103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TF0000X Family Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TF0200X Forensic Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TM1800X Intellectual & Developmental Disabilities Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TP2701X Group Psychotherapy Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TR0400X Rehabilitation Psychologist Behavioral Health & Social Service Providers · License 123 (SD) Secondary
103TS0200X School Psychologist Behavioral Health & Social Service Providers · License 29664-02 (SD) Secondary

Other identifiers

Identifier Type State Issuer
6550193 Medicaid SD -
460461452-26 Medicaid NE -

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

What is the NPI number for Dewey Ertz?
The National Provider Identifier (NPI) for Dewey Ertz is 1164606570, a Type 1 (individual) record in the CMS NPPES registry.
Where does Dewey Ertz practice?
The practice location on file with NPPES is in Rapid City, SD. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-12-20.