EDWARD HALOMOAN SIAHAAN CTRS
NPI 1205771086
Recreation Therapist in Riverside, CA

NPI Status: Active since April 20, 2026

Contact Information

3933 HARRISON ST
RIVERSIDE, CA
ZIP 92503
Phone: (833) 391-0505

NPI Profile Information
Primary Taxonomy
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Recreation Therapist

About EDWARD SIAHAAN

This page provides the complete NPI Profile along with additional information for Edward Siahaan, a provider established in Riverside, California with a medical specialization in Recreation Therapist. The healthcare provider is registered in the NPI registry with number 1205771086 assigned on April 2026. The practitioner's primary taxonomy code is 225800000X with license number CTRS32156 (CA). The provider is registered as an individual and his NPI record was last updated April 2026.

NPI: 1205771086
Provider Name: EDWARD HALOMOAN SIAHAAN CTRS
Gender: Male
Entity Type: Individual
Location Address: 3933 HARRISON ST RIVERSIDE, CA 92503
Location Phone: (833) 391-0505
Mailing Address: 3933 HARRISON ST RIVERSIDE, CA 92503
Mailing Phone: (833) 391-0505
Is Sole Proprietor?: No
Enumeration Date: 04-20-2026
Last Update Date: 04-20-2026
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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: Recreation Therapist
Taxonomy Code: 225800000X
Type: Respiratory, Developmental, Rehabilitative and Restorative Service Providers
License No.: CTRS32156
License State: CA
Taxonomy Description: A recreation therapist uses recreational activities for intervention in some physical, social or emotional behavior to bring about a desired change in that behavior and promote the growth and development of the patient.

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 1205771086, we treat the final digit (6) 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 6).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 0

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 6

Check

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 0 → 0 7 → 14 → 5 1 → 2 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 0 + 5 + 1 + 4 + 7 + 2 + 0 + 1 + 6 + 24 = 54

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

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1205771086.