SHAWN GESSAY MS, CGC
NPI 1639954035
Genetic Counselor, MS in San Antonio, TX

NPI Status: Active since August 25, 2023

Contact Information

4502 MEDICAL DR
SAN ANTONIO, TX
ZIP 78229
Phone: (210) 358-1377

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

Individual
Female
Genetic Counselor, MS

About SHAWN GESSAY

This page provides the complete NPI Profile along with additional information for Shawn Gessay, a provider established in San Antonio, Texas with a medical specialization in Genetic Counselor, Ms. The healthcare provider is registered in the NPI registry with number 1639954035 assigned on August 2023. The practitioner's primary taxonomy code is 170300000X. The provider is registered as an individual and her NPI record was last updated 3 years ago.

NPI: 1639954035
Provider Name: SHAWN GESSAY MS, CGC
Gender: Female
Entity Type: Individual
Location Address: 4502 MEDICAL DR SAN ANTONIO, TX 78229
Location Phone: (210) 358-1377
Mailing Address: 4502 MEDICAL DR SAN ANTONIO, TX 78229
Mailing Phone: (210) 358-1377
Is Sole Proprietor?: No
Enumeration Date: 08-25-2023
Last Update Date: 08-25-2023
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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: Genetic Counselor, MS
Taxonomy Code: 170300000X
Type: Other Service Providers
Taxonomy Description: A masters trained health care provider who collects and interprets genetic family histories; assesses the risk of disease occurrence or recurrence; identifies interventions to manage or ameliorate disease risk; educates about inheritance, testing, management, prevention, ethical issues, resources, and research; and counsels to promote informed choices and adaptation. Certification was established in 1993 by the American Board of Genetic Counseling and prior to that by the American Board of Medical Genetics. Requirements for experience, licensure, and job responsibilities vary among the states.

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 1639954035, we treat the final digit (5) 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 75. The final step is to find the difference between that total and the next multiple of ten (80 - 75 = 5).

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 → 6

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 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 3 → 6 9 → 18 → 9 4 → 8 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 6 + 9 + 1 + 8 + 5 + 8 + 0 + 6 + 24 = 75

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

The next multiple of ten after 75 is 80. The difference is the calculated check digit.

80 - 75 = 5

This NPI is valid

The calculated check digit is 5, which matches the last digit of 1639954035.