WILLIAM LEHMAN
NPI 1770431207
Counselor - Mental Health in Gilbert, AZ

NPI Status: Active since March 19, 2026

Contact Information

3303 E BASELINE RD STE 109
GILBERT, AZ
ZIP 85234
Phone: (480) 900-8765

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

Individual
Counselor
Mental Health

About WILLIAM LEHMAN

This page provides the complete NPI Profile along with additional information for William Lehman, a provider established in Gilbert, Arizona operating as a Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1770431207 assigned on March 2026. The practitioner's primary taxonomy code is 101YM0800X with license number LAC-23638 (AZ). The provider is registered as an individual and their NPI record was last updated March 2026.

NPI: 1770431207
Provider Name: WILLIAM LEHMAN
Gender
Entity Type: Individual
Location Address: 3303 E BASELINE RD STE 109 GILBERT, AZ 85234
Location Phone: (480) 900-8765
Mailing Address: 3303 E BASELINE RD STE 109 GILBERT, AZ 85234
Is Sole Proprietor?: No
Enumeration Date: 03-19-2026
Last Update Date: 03-19-2026
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A mental health counselor like William Lehman provides treatment to individuals, families, couples, and groups for mental and emotional health issues and relationship problems. Mental health counselors treat clients with a variety of conditions, including anxiety, depression, grief, low self-esteem, stress, and suicidal impulses.

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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 Mental Health
Taxonomy Code: 101YM0800X
Type: Behavioral Health & Social Service Providers
License No.: LAC-23638
License State: AZ

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 1770431207, we treat the final digit (7) 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 7).

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 → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 0

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 7 → 14 → 5 4 → 8 1 → 2 0 → 0

Step 2: Add all digits plus the NPI constant

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

2 + 7 + 1 + 4 + 0 + 8 + 3 + 2 + 2 + 0 + 24 = 53

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

The next multiple of ten after 53 is 60. The difference is the calculated check digit.

60 - 53 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1770431207.