PSYCHOLOGICAL EVALUATION THERAPY & RESEARCH LTD
NPI 1790709145
Psychologist - School in Rapid City, SD

NPI Status: Active since July 27, 2006

Contact Information

3601 CANYON LAKE DRIVE
RAPID CITY, SD
ZIP 57702
Phone: (605) 341-8647
Fax: (605) 341-0489

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  • Organization
  • Psychologist
  • School

About PSYCHOLOGICAL EVALUATION THERAPY & RESEARCH LTD

This page provides the complete NPI Profile along with additional information for Psychological Evaluation Therapy & Research Ltd, a provider established in Rapid City, South Dakota operating as a Psychologist, focusing in school . The healthcare provider is registered in the NPI registry with number 1790709145 assigned on July 2006. The practitioner's primary taxonomy code is 103TS0200X with license number 123 (SD). The provider is registered as an organization and their NPI record was last updated one year ago. Psychological Evaluation Therapy & Research Ltd operates as a Multi-Specialty Group with one or more individual practitioners, who practice different areas of specialization. The authorized official of this NPI record is Dr. Dewey J Ertz Ed D (President Psychologist)

NPI
1790709145
Provider Name
PSYCHOLOGICAL EVALUATION THERAPY & RESEARCH LTD
Entity Type
Organization
Location Address
3601 CANYON LAKE DRIVE RAPID CITY, SD 57702
Location Phone
(605) 341-8647
Location Fax
(605) 341-0489
Mailing Address
3601 CANYON LAKE DRIVE RAPID CITY, SD 57702
Mailing Phone
(605) 341-8647
Mailing Fax
(605) 341-0489
Is Sole Proprietor?
No
Is Organization Subpart?
No
Enumeration Date
07-27-2006
Last Update Date
09-11-2025
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Psychologist School

Taxonomy Code
103TS0200X
Type
Behavioral Health & Social Service Providers
License No.
123
License State
SD
Taxonomy Description
A psychologist whose specialty is concerned with the science and practice of psychology with children, youth, families; learners of all ages; and the schooling process. The basic education and training of school psychologists prepares them to provide a range of psychological diagnosis, assessment, intervention, prevention, health promotion, and program development and evaluation services with a special focus on the developmental processes of children and youth within the context of schools, families and other systems. School psychologists are prepared to intervene at the individual and system level, and develop, implement, and evaluate preventive programs. In these efforts, they conduct ecologically valid assessments and intervene to promote positive learning environments within which children and youth from diverse backgrounds to ensure that all have equal access to effective educational and psychological services that promote healthy development

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1103T00000XBehavioral Health & Social Service Providers

Psychologist

123 (SD)
2103TA0400XBehavioral Health & Social Service Providers

Psychologist
Addiction (Substance Use Disorder)

123 (SD)
3103TC0700XBehavioral Health & Social Service Providers

Psychologist
Clinical

123 (SD)
4103TF0000XBehavioral Health & Social Service Providers

Psychologist
Family

123 (SD)
5103TF0200XBehavioral Health & Social Service Providers

Psychologist
Forensic

123 (SD)
6103TM1800XBehavioral Health & Social Service Providers

Psychologist
Intellectual and Developmental Disabilities

123 (SD)
7103TR0400XBehavioral Health & Social Service Providers

Psychologist
Rehabilitation

123 (SD)

Group Taxonomy 193200000X MULTI-SPECIALTY GROUP

This provider is a business group of one or more individual practitioners, who practice with different areas of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name

DR. DEWEY J ERTZ ED D

Authorized Official Title
PRESIDENT PSYCHOLOGIST
Authorized Official Phone
(605) 341-8647

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1790709145, we treat the final digit (5) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
7
Unchanged
Pos 3
9
Doubled → 18 → 1 + 8
Pos 4
0
Unchanged
Pos 5
7
Doubled → 14 → 1 + 4
Pos 6
0
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
1
Unchanged
Pos 9
4
Doubled → 8
Check
5
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 9 → 18 → 9 7 → 14 → 5 9 → 18 → 9 4 → 8

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 7 + 1 + 8 + 0 + 1 + 4 + 0 + 1 + 8 + 1 + 8 + 24 = 65

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 65 is 70. The difference is the calculated check digit.

70 - 65 = 5
This NPI is valid
The calculated check digit is 5, which matches the last digit of 1790709145.

Other Providers at the Same Location


The following 1 provider is registered at the same or a nearby location.

Psychologist
3601 CANYON LAKE DRIVE
RAPID CITY, SD 57702

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1790709145, enumerated as an "organization" on July 27, 2006.

The provider is located at 3601 CANYON LAKE DRIVE RAPID CITY, SD 57702 and the phone number is (605) 341-8647.

Psychologist with taxonomy code 103TS0200X and a focus in School.