DR. GRETCHEN GYVING GILLINGHAM PHD
NPI 1841179017
Clinical Neuropsychologist in San Diego, CA

NPI Status: Active since August 30, 2025

Contact Information

3754 CLAIREMONT DR
SAN DIEGO, CA
ZIP 92117
Phone: (619) 276-6912

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

Individual
Female
Clinical Neuropsychologist

About GRETCHEN GILLINGHAM

This page provides the complete NPI Profile along with additional information for Gretchen Gillingham, a provider established in San Diego, California with a medical specialization in Clinical Neuropsychologist. The healthcare provider is registered in the NPI registry with number 1841179017 assigned on August 2025. The practitioner's primary taxonomy code is 103G00000X with license number PSY20163 (CA). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1841179017
Provider Name: DR. GRETCHEN GYVING GILLINGHAM PHD
Gender: Female
Entity Type: Individual
Location Address: 3754 CLAIREMONT DR SAN DIEGO, CA 92117
Location Phone: (619) 276-6912
Mailing Address: 4898 TALTEC DR LA MESA, CA 91941
Mailing Phone: (619) 804-5648
Is Sole Proprietor?: Yes
Enumeration Date: 08-30-2025
Last Update Date: 08-30-2025
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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: Clinical Neuropsychologist
Taxonomy Code: 103G00000X
Type: Behavioral Health & Social Service Providers
License No.: PSY20163
License State: CA
Taxonomy Description: A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems.

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 1841179017, 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 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 4 → 8 1 → 2 9 → 18 → 9 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 8 + 1 + 2 + 7 + 1 + 8 + 0 + 2 + 24 = 63

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

The next multiple of ten after 63 is 70. The difference is the calculated check digit.

70 - 63 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1841179017.