TERESA CAROL CLAY
NPI 1225900061
Speech-Language Pathologist in Winchester, VA

NPI Status: Active since September 22, 2025

Contact Information

1415 AMHERST ST
WINCHESTER, VA
ZIP 22601
Phone: (540) 662-3888
Fax: (540) 665-2461

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

Individual
Female
Speech-Language Pathologist

About TERESA CLAY

This page provides the complete NPI Profile along with additional information for Teresa Clay, a provider established in Winchester, Virginia with a medical specialization in Speech-language Pathologist. The healthcare provider is registered in the NPI registry with number 1225900061 assigned on September 2025. The practitioner's primary taxonomy code is 235Z00000X with license number 2203000297 (VA). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1225900061
Provider Name: TERESA CAROL CLAY
Gender: Female
Entity Type: Individual
Location Address: 1415 AMHERST ST WINCHESTER, VA 22601
Location Phone: (540) 662-3888
Location Fax: (540) 665-2461
Mailing Address: 1415 AMHERST ST WINCHESTER, VA 22601
Mailing Phone: (540) 662-3888
Mailing Fax: (540) 665-2461
Is Sole Proprietor?: No
Enumeration Date: 09-22-2025
Last Update Date: 09-22-2025
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: Speech-Language Pathologist
Taxonomy Code: 235Z00000X
Type: Speech, Language and Hearing Service Providers
License No.: 2203000297
License State: VA
Taxonomy Description: The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.

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 1225900061, we treat the final digit (1) 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 49. The final step is to find the difference between that total and the next multiple of ten (50 - 49 = 1).

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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 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 2 → 4 9 → 18 → 9 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 + 2 + 4 + 5 + 1 + 8 + 0 + 0 + 0 + 1 + 2 + 24 = 49

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

The next multiple of ten after 49 is 50. The difference is the calculated check digit.

50 - 49 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1225900061.