MR. MARK DAVID NORRIS
NPI 1942479480
Counselor - Professional in Covina, CA

NPI Status: Active since February 28, 2008

Contact Information

560 S SAN JOSE AVE
COVINA, CA
ZIP 91723
Phone: (686) 967-5103

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

Individual
Male
Counselor
Professional

About MARK NORRIS

This page provides the complete NPI Profile along with additional information for Mark Norris, a provider established in Covina, California with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1942479480 assigned on February 2008. The practitioner's primary taxonomy code is 101YP2500X. The provider is registered as an individual and his NPI record was last updated 18 years ago.

NPI: 1942479480
Provider Name: MR. MARK DAVID NORRIS
Gender: Male
Entity Type: Individual
Location Address: 560 S SAN JOSE AVE COVINA, CA 91723
Location Phone: (686) 967-5103
Mailing Address: PO BOX 2168 APPLE VALLEY, CA 92307
Mailing Phone: (818) 601-2827
Is Sole Proprietor?: No
Enumeration Date: 02-28-2008
Last Update Date: 02-28-2008
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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

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No.	Taxonomy Code	Type	Classification / Specialization	License No. (State)
1	101Y00000X	Behavioral Health & Social Service Providers	Counselor
2	101Y00000X	Behavioral Health & Social Service Providers	Counselor	(CA)

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 1942479480, 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 80. The final step is to find the difference between that total and the next multiple of ten (80 - 80 = 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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

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 4 → 8 4 → 8 9 → 18 → 9 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 9 + 8 + 2 + 8 + 7 + 1 + 8 + 4 + 1 + 6 + 24 = 80

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

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

80 - 80 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1942479480.