MS. ILENE RETH
NPI 1902973381
Day Training/Habilitation Specialist in Long Beach, CA

NPI Status: Active since November 29, 2006

Contact Information

4510 E PACIFIC COAST HWY STE 600
LONG BEACH, CA
ZIP 90804
Phone: (562) 346-1100
Fax: (562) 685-0867

Recently Updated NPI Information
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.

Table of Contents

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

Individual
Female
Day Training/Habilitation Specialist

About ILENE RETH

This page provides the complete NPI Profile along with additional information for Ilene Reth, a provider established in Long Beach, California with a medical specialization in Day Training/habilitation Specialist. The healthcare provider is registered in the NPI registry with number 1902973381 assigned on November 2006. The practitioner's primary taxonomy code is 373H00000X. The provider is registered as an individual and her NPI record was last updated June 2026.

NPI: 1902973381
Provider Name: MS. ILENE RETH
Gender: Female
Entity Type: Individual
Location Address: 4510 E PACIFIC COAST HWY STE 600 LONG BEACH, CA 90804
Location Phone: (562) 346-1100
Location Fax: (562) 685-0867
Mailing Address: 4510 E PACIFIC COAST HWY STE 600 LONG BEACH, CA 90804
Mailing Phone: (562) 346-1100
Is Sole Proprietor?: No
Enumeration Date: 11-29-2006
Last Update Date: 06-22-2026
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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: Day Training/Habilitation Specialist
Taxonomy Code: 373H00000X
Type: Nursing Service Related Providers
License State: CA
Taxonomy Description: Individuals experienced or trained in working with developmentally disabled individuals who need assistance in acquiring and maintaining life skills that enable them to cope more effectively with the demands of independent living.

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)
1	171M00000X	Other Service Providers	Case Manager/Care Coordinator
2	172V00000X	Other Service Providers	Community Health Worker	(CA)
3	225400000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Rehabilitation Practitioner

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 1902973381, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).

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 → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 6

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 9 → 18 → 9 3 → 6 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 9 + 0 + 2 + 1 + 8 + 7 + 6 + 3 + 1 + 6 + 24 = 69

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

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1902973381.