CHICO CASTILLO SUD COUNSELOR 2
NPI 1801724836
Counselor - Addiction (Substance Use Disorder) in Stockton, CA

NPI Status: Active since May 11, 2026

Contact Information

1031 WATERLOO RD
STOCKTON, CA
ZIP 95205
Phone: (209) 940-5662

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

Individual
Male
Counselor
Addiction (Substance Use Disorder)

About CHICO CASTILLO

This page provides the complete NPI Profile along with additional information for Chico Castillo, a provider established in Stockton, California with a medical specialization in Counselor, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1801724836 assigned on May 2026. The practitioner's primary taxonomy code is 101YA0400X with license number 24252 (CA). The provider is registered as an individual and his NPI record was last updated May 2026. Chico Castillo operates as a Multi-Specialty Group with one or more individual practitioners, who practice different areas of specialization.

NPI: 1801724836
Provider Name: CHICO CASTILLO SUD COUNSELOR 2
Gender: Male
Entity Type: Individual
Location Address: 1031 WATERLOO RD STOCKTON, CA 95205
Location Phone: (209) 940-5662
Mailing Address: 7210 MURRAY DR STOCKTON, CA 95210
Mailing Phone: (209) 373-2800
Is Sole Proprietor?: Yes
Enumeration Date: 05-11-2026
Last Update Date: 05-11-2026
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A Substance Abuse or Addiction Counselor like Chico Castillo advices patients who experience alcoholism, drug addiction, eating disorders, mental health issues, or other mental or behavioral problems. Substance Abuse counselors provide treatment and support to help clients recover from addiction or modify problem behaviors. Many counselors incorporate the principles of 12-step programs, such as Alcoholics Anonymous (AA). They educate clients how to cope with stress and life’s issues in ways that help them recover. Counselors also help patients improve their personal relationships and find ways to discuss their addiction or other problems with family and friends.

Location Map

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: Counselor Addiction (Substance Use Disorder)
Taxonomy Code: 101YA0400X
Type: Behavioral Health & Social Service Providers
License No.: 24252
License State: CA

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.

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 1801724836, 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 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 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 → 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 7 → 14 → 5 4 → 8 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 0 + 1 + 1 + 4 + 2 + 8 + 8 + 6 + 24 = 64

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

The next multiple of ten after 64 is 70. The difference is the calculated check digit.

70 - 64 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1801724836.