MISS GAIL G WILLIAMS ADHS DOULA CERTIFIED
NPI 1073460564
Doula in Phoenix, AZ

NPI Status: Active since March 13, 2026

Contact Information

4539 N 22ND ST STE R
PHOENIX, AZ
ZIP 85016
Phone: (623) 377-4296

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

Individual
Female
Doula

About GAIL WILLIAMS

This page provides the complete NPI Profile along with additional information for Gail Williams, a provider established in Phoenix, Arizona with a medical specialization in Doula. The healthcare provider is registered in the NPI registry with number 1073460564 assigned on March 2026. The practitioner's primary taxonomy code is 374J00000X with license number DOU220 (AZ). The provider is registered as an individual and her NPI record was last updated March 2026. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization.

NPI: 1073460564
Provider Name: MISS GAIL G WILLIAMS ADHS DOULA CERTIFIED
Gender: Female
Entity Type: Individual
Location Address: 4539 N 22ND ST STE R PHOENIX, AZ 85016
Location Phone: (623) 377-4296
Mailing Address: 4539 N 22ND ST STE R PHOENIX, AZ 85016
Mailing Phone: (623) 377-4296
Is Sole Proprietor?: Yes
Enumeration Date: 03-13-2026
Last Update Date: 03-13-2026
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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: Doula
Taxonomy Code: 374J00000X
Type: Nursing Service Related Providers
License No.: DOU220
License State: AZ
Taxonomy Description: Doulas work in a variety of settings and have been trained to provide physical, emotional, and informational support to a mother before, during, and just after birth and/or provide emotional and practical support to a mother during the postpartum period.

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

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 1073460564, we treat the final digit (4) 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 56. The final step is to find the difference between that total and the next multiple of ten (60 - 56 = 4).

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 → 0

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 7 → 14 → 5 4 → 8 0 → 0 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 1 + 4 + 3 + 8 + 6 + 0 + 5 + 1 + 2 + 24 = 56

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

The next multiple of ten after 56 is 60. The difference is the calculated check digit.

60 - 56 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1073460564.