ALEXANDRA RUTH WILLIAMS LCDC
NPI 1003757196
Counselor - Addiction (Substance Use Disorder) in Mckinney, TX

NPI Status: Active since April 02, 2026

Contact Information

405 N MCDONALD ST STE B
MCKINNEY, TX
ZIP 75069
Phone: (972) 542-4144
Fax: (972) 542-4154

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

Individual
Female
Counselor
Addiction (Substance Use Disorder)

About ALEXANDRA WILLIAMS

This page provides the complete NPI Profile along with additional information for Alexandra Williams, a provider established in Mckinney, Texas with a medical specialization in Counselor, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1003757196 assigned on April 2026. The practitioner's primary taxonomy code is 101YA0400X with license number 17585 (TX). The provider is registered as an individual and her NPI record was last updated April 2026.

NPI: 1003757196
Provider Name: ALEXANDRA RUTH WILLIAMS LCDC
Gender: Female
Entity Type: Individual
Location Address: 405 N MCDONALD ST STE B MCKINNEY, TX 75069
Location Phone: (972) 542-4144
Location Fax: (972) 542-4154
Mailing Address: 8444 N 90TH ST STE 100 SCOTTSDALE, AZ 85258
Mailing Phone: (602) 248-8886
Mailing Fax: (972) 542-4154
Is Sole Proprietor?: No
Enumeration Date: 04-02-2026
Last Update Date: 04-02-2026
Code Navigator

A Substance Abuse or Addiction Counselor like Alexandra Williams 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.: 17585
License State: TX

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 1003757196, 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 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 → 14 → 1 + 4

Pos 8

Unchanged

Pos 9

Doubled → 18 → 1 + 8

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 7 → 14 → 5 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 0 + 3 + 1 + 4 + 5 + 1 + 4 + 1 + 1 + 8 + 24 = 54

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

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1003757196.