ALLY LYNN WILLIAMS RBT
NPI 1346963568
Behavior Analyst in Saint Louis, MO

NPI Status: Active since September 22, 2022

Contact Information

5425 SOUTHFIELD CTR
SAINT LOUIS, MO
ZIP 63123
Phone: (217) 525-8332
Fax: (217) 789-1420

Recently Updated NPI Information
Some details in this NPI profile have been updated in 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
Female
Behavior Analyst

About ALLY WILLIAMS

This page provides the complete NPI Profile along with additional information for Ally Williams, a provider established in Saint Louis, Missouri with a medical specialization in Behavior Analyst. The healthcare provider is registered in the NPI registry with number 1346963568 assigned on September 2022. The practitioner's primary taxonomy code is 103K00000X. The provider is registered as an individual and her NPI record was last updated May 2026.

NPI: 1346963568
Provider Name: ALLY LYNN WILLIAMS RBT
Gender: Female
Entity Type: Individual
Location Address: 5425 SOUTHFIELD CTR SAINT LOUIS, MO 63123
Location Phone: (217) 525-8332
Location Fax: (217) 789-1420
Mailing Address: 5220 6TH STREET FRONTAGE RD E STE 1700 SPRINGFIELD, IL 62703
Mailing Phone: (217) 525-8332
Mailing Fax: (217) 789-1420
Is Sole Proprietor?: No
Enumeration Date: 09-22-2022
Last Update Date: 05-18-2026
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: Behavior Analyst
Taxonomy Code: 103K00000X
Type: Behavioral Health & Social Service Providers
Taxonomy Description: A behavior analyst is qualified by at least a master's degree and Behavior Analyst Certification Board certification and/or a state-issued credential (such as a license) to practice behavior analysis independently. Behavior analysts provide the required supervision to assistant behavior analysts and behavior technicians. A behavior analyst delivers services consistent with the dimensions of applied behavior analysis. Common services may include, but are not limited to, conducting behavioral assessments, analyzing data, writing and revising behavior-analytic treatment plans, training others to implement components of treatment plans, and overseeing implementation of treatment plans.

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 1346963568, we treat the final digit (8) 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 72. The final step is to find the difference between that total and the next multiple of ten (80 - 72 = 8).

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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 12 → 1 + 2

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 4 → 8 9 → 18 → 9 3 → 6 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 8 + 6 + 1 + 8 + 6 + 6 + 5 + 1 + 2 + 24 = 72

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

The next multiple of ten after 72 is 80. The difference is the calculated check digit.

80 - 72 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1346963568.