ANDREW THOMAS CASTRO MA
NPI 1669696423
Counselor in Santa Cruz, CA

NPI Status: Active since April 12, 2007

Contact Information

530 SOQUEL AVE
SANTA CRUZ, CA
ZIP 95062
Phone: (831) 426-7324

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

Individual
Male
Counselor

About ANDREW CASTRO

This page provides the complete NPI Profile along with additional information for Andrew Castro, a provider established in Santa Cruz, California with a medical specialization in Counselor. The healthcare provider is registered in the NPI registry with number 1669696423 assigned on April 2007. The practitioner's primary taxonomy code is 101Y00000X. The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1669696423
Provider Name: ANDREW THOMAS CASTRO MA
Gender: Male
Entity Type: Individual
Location Address: 530 SOQUEL AVE SANTA CRUZ, CA 95062
Location Phone: (831) 426-7324
Mailing Address: 3115 DEE ST SANTA CRUZ, CA 95062
Mailing Phone: (831) 475-4640
Is Sole Proprietor?: Yes
Enumeration Date: 04-12-2007
Last Update Date: 05-11-2026
Code Navigator

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
Taxonomy Code: 101Y00000X
Type: Behavioral Health & Social Service Providers
Taxonomy Description: A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification.

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 1669696423, we treat the final digit (3) 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 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).

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 → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 12 → 1 + 2

Pos 6

Unchanged

Pos 7

Doubled → 12 → 1 + 2

Pos 8

Unchanged

Pos 9

Doubled → 4

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 6 → 12 → 3 6 → 12 → 3 6 → 12 → 3 2 → 4

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 1 + 2 + 9 + 1 + 2 + 9 + 1 + 2 + 4 + 4 + 24 = 67

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

The next multiple of ten after 67 is 70. The difference is the calculated check digit.

70 - 67 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1669696423.