MARISSA M DIAZ LCSW, PPSC
NPI 1902579030
Social Worker - School in Garden Grove, CA

NPI Status: Active since July 26, 2021

Contact Information

10331 STANFORD AVE
GARDEN GROVE, CA
ZIP 92840
Phone: (714) 663-6000

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

Individual
Female
Social Worker
School

About MARISSA DIAZ

This page provides the complete NPI Profile along with additional information for Marissa Diaz, a provider established in Garden Grove, California with a medical specialization in Social Worker, focusing in school . The healthcare provider is registered in the NPI registry with number 1902579030 assigned on July 2021. The practitioner's primary taxonomy code is 1041S0200X with license number 122024 (CA). The provider is registered as an individual and her NPI record was last updated May 2026.

NPI: 1902579030
Provider Name: MARISSA M DIAZ LCSW, PPSC
Gender: Female
Entity Type: Individual
Location Address: 10331 STANFORD AVE GARDEN GROVE, CA 92840
Location Phone: (714) 663-6000
Mailing Address: 10331 STANFORD AVE GARDEN GROVE, CA 92840
Mailing Phone: (714) 663-6000
Is Sole Proprietor?: No
Enumeration Date: 07-26-2021
Last Update Date: 05-18-2026
Code Navigator

A school social worker like Marissa Diaz works with teachers, parents, and school administrators to develop plans and strategies to improve students' academic performance and social development. Students are referred to school social workers to deal with problems like aggressive behavior, bullying, or frequent school absences.

Location Map

Secondary Locations

1 Hope Dr
Tustin, CA 92782
(714) 247-0300
1100B N Tustin Ave Ste A
Santa Ana, CA 92705
(714) 247-0300
14642 Newport Ave Ste 200
Tustin, CA 92780
(714) 247-0300
947 S Anaheim Blvd Ste 260
Anaheim, CA 92805
(714) 247-0300

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: Social Worker School
Taxonomy Code: 1041S0200X
Type: Behavioral Health & Social Service Providers
License No.: 122024
License State: CA

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 1902579030, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

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 → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 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 5 → 10 → 1 9 → 18 → 9 3 → 6

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 + 0 + 7 + 1 + 8 + 0 + 6 + 24 = 60

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

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

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1902579030.