MARJORIE AARIN PIERCE
NPI 1134090889
Licensed Vocational Nurse in Redwood City, CA

NPI Status: Active since September 16, 2025

Contact Information

1410 MARSHALL ST
REDWOOD CITY, CA
ZIP 94063
Phone: (650) 373-0777

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

Individual
Female
Licensed Vocational Nurse

About MARJORIE PIERCE

This page provides the complete NPI Profile along with additional information for Marjorie Pierce, a provider established in Redwood City, California with a medical specialization in Licensed Vocational Nurse. The healthcare provider is registered in the NPI registry with number 1134090889 assigned on September 2025. The practitioner's primary taxonomy code is 164X00000X with license number VN712230 (CA). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1134090889
Provider Name: MARJORIE AARIN PIERCE
Gender: Female
Entity Type: Individual
Location Address: 1410 MARSHALL ST REDWOOD CITY, CA 94063
Location Phone: (650) 373-0777
Mailing Address: 1410 MARSHALL ST REDWOOD CITY, CA 94063
Mailing Phone: (650) 373-0777
Is Sole Proprietor?: No
Enumeration Date: 09-16-2025
Last Update Date: 09-16-2025
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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: Licensed Vocational Nurse
Taxonomy Code: 164X00000X
Type: Nursing Service Providers
License No.: VN712230
License State: CA
Taxonomy Description: A licensed vocational nurse with post-high school vocational training and practical experience in the provision of nursing care at a level less than that required for certification as a Registered Nurse. [An alternate term for licensed practical nurse arising from difference in occupational titles between states and post-high school training programs and institutions.] Requirements for education, 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 1134090889, we treat the final digit (9) 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 9).

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 → 0

Pos 6

Unchanged

Pos 7

Doubled → 0

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 3 → 6 0 → 0 0 → 0 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 6 + 4 + 0 + 9 + 0 + 8 + 1 + 6 + 24 = 61

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

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1134090889.