MS. TONYA RENEE HAMMER LPC
NPI 1881801280
Counselor - Professional in San Antonio, TX

NPI Status: Active since May 16, 2007

Contact Information

4415 W PIEDRAS DR
SUITE 208
SAN ANTONIO, TX
ZIP 78228
Phone: (210) 733-9929
Fax: (210) 733-9916

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

Individual
Female
Counselor
Professional

About TONYA HAMMER

This page provides the complete NPI Profile along with additional information for Tonya Hammer, a provider established in San Antonio, Texas with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1881801280 assigned on May 2007. The practitioner's primary taxonomy code is 101YP2500X with license number 61312 (TX). The provider is registered as an individual and her NPI record was last updated 19 years ago.

NPI: 1881801280
Provider Name: MS. TONYA RENEE HAMMER LPC
Gender: Female
Entity Type: Individual
Location Address: 4415 W PIEDRAS DR SUITE 208 SAN ANTONIO, TX 78228
Location Phone: (210) 733-9929
Location Fax: (210) 733-9916
Mailing Address: 3500 OAKGATE DR APT. 808 SAN ANTONIO, TX 78230
Mailing Phone: (210) 863-0785
Mailing Fax: (210) 733-9916
Is Sole Proprietor?: No
Enumeration Date: 05-16-2007
Last Update Date: 07-08-2007
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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 Professional
Taxonomy Code: 101YP2500X
Type: Behavioral Health & Social Service Providers
License No.: 61312
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 1881801280, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

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 → 16 → 1 + 6

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 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 8 → 16 → 7 8 → 16 → 7 1 → 2 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 1 + 6 + 1 + 1 + 6 + 0 + 2 + 2 + 1 + 6 + 24 = 60

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

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

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1881801280.