KARYN DUGGAN MS, CNS, IFMCP
NPI 1356773592
Nutritionist in San Francisco, CA

NPI Status: Active since July 30, 2013

Contact Information

2410 CALIFORNIA ST
SAN FRANCISCO, CA
ZIP 94115
Phone: (415) 529-4050

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

Individual
Female
Nutritionist

About KARYN DUGGAN

This page provides the complete NPI Profile along with additional information for Karyn Duggan, a provider established in San Francisco, California with a medical specialization in Nutritionist. The healthcare provider is registered in the NPI registry with number 1356773592 assigned on July 2013. The practitioner's primary taxonomy code is 133N00000X. The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1356773592
Provider Name: KARYN DUGGAN MS, CNS, IFMCP
Gender: Female
Entity Type: Individual
Location Address: 2410 CALIFORNIA ST SAN FRANCISCO, CA 94115
Location Phone: (415) 529-4050
Mailing Address: 70 CURREY AVE SAUSALITO, CA 94965
Mailing Phone: (415) 505-4423
Is Sole Proprietor?: No
Enumeration Date: 07-30-2013
Last Update Date: 09-11-2025
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Location Map

Secondary Locations

70 Currey Ave
Sausalito, CA 94965
(415) 505-4423

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: Nutritionist
Taxonomy Code: 133N00000X
Type: Dietary & Nutritional Service Providers
Taxonomy Description: A specialist in adapting and applying food and nutrient knowledge to the solution of food and nutritional problems, the control of disease, and the promotion of health. Nutritionists perform research, instruct groups and individuals about nutritional requirements, and assist people in developing meal patterns that meet their nutritional needs; (2) A nutritionist is someone who has completed undergraduate and/or graduate training in the discipline of nutrition without necessarily meeting the academic and experience requirements to qualify for the Registered Dietitian designation.

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 1356773592, we treat the final digit (2) 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 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).

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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 18 → 1 + 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 5 → 10 → 1 7 → 14 → 5 3 → 6 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 1 + 0 + 6 + 1 + 4 + 7 + 6 + 5 + 1 + 8 + 24 = 68

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

The next multiple of ten after 68 is 70. The difference is the calculated check digit.

70 - 68 = 2

This NPI is valid

The calculated check digit is 2, which matches the last digit of 1356773592.