NATALIE CROSBY
NPI 1629909031
Counselor - Addiction (Substance Use Disorder) in Santa Monica, CA

NPI Status: Active since May 26, 2026

Contact Information

844 PICO BLVD
SANTA MONICA, CA
ZIP 90405
Phone: (310) 314-6200

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

Table of Contents

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

Individual
Counselor
Addiction (Substance Use Disorder)

About NATALIE CROSBY

This page provides the complete NPI Profile along with additional information for Natalie Crosby, a provider established in Santa Monica, California operating as a Counselor, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1629909031 assigned on May 2026. The practitioner's primary taxonomy code is 101YA0400X with license number R1551290224 (CA). The provider is registered as an individual and their NPI record was last updated May 2026.

NPI: 1629909031
Provider Name: NATALIE CROSBY
Gender
Entity Type: Individual
Location Address: 844 PICO BLVD SANTA MONICA, CA 90405
Location Phone: (310) 314-6200
Mailing Address: 17252 HAWTHORNE BLVD TORRANCE, CA 90504
Is Sole Proprietor?: Yes
Enumeration Date: 05-26-2026
Last Update Date: 05-26-2026
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A Substance Abuse or Addiction Counselor like Natalie Crosby 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.

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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: Counselor Addiction (Substance Use Disorder)
Taxonomy Code: 101YA0400X
Type: Behavioral Health & Social Service Providers
License No.: R1551290224
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 1629909031, 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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

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 2 → 4 9 → 18 → 9 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 + 6 + 4 + 9 + 1 + 8 + 0 + 1 + 8 + 0 + 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 1629909031.