DR. GREGG A RICHARDSON PHD
NPI 1710052840
Clinical Neuropsychologist in Oakland, CA

NPI Status: Active since November 22, 2006

Contact Information

275 W MACARTHUR
OAKLAND, CA
ZIP 94611
Phone: (510) 752-1000

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

Individual
Male
Clinical Neuropsychologist

About GREGG RICHARDSON

This page provides the complete NPI Profile along with additional information for Gregg Richardson, a provider established in Oakland, California with a medical specialization in Clinical Neuropsychologist. The healthcare provider is registered in the NPI registry with number 1710052840 assigned on November 2006. The practitioner's primary taxonomy code is 103G00000X with license number PSY 16835 (CA). The provider is registered as an individual and his NPI record was last updated 12 years ago.

NPI: 1710052840
Provider Name: DR. GREGG A RICHARDSON PHD
Gender: Male
Entity Type: Individual
Location Address: 275 W MACARTHUR OAKLAND, CA 94611
Location Phone: (510) 752-1000
Mailing Address: 275 W MACARTHUR OAKLAND, CA 94611
Mailing Phone: (510) 752-1000
Is Sole Proprietor?: No
Enumeration Date: 11-22-2006
Last Update Date: 09-18-2014
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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.: PSY 16835
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 1710052840, 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 → 2

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 4

Pos 8

Unchanged

Pos 9

Doubled → 8

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 1 → 2 0 → 0 2 → 4 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 7 + 2 + 0 + 0 + 5 + 4 + 8 + 8 + 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 1710052840.