MS. MARCIA TUMY BYRNES RN, FNP
NPI 1801035043
Nurse Practitioner - Family in San Rafael, CA

NPI Status: Active since February 11, 2009

Contact Information

16 RITTER ST
SAN RAFAEL, CA
ZIP 94901
Phone: (415) 457-8182
Fax: (415) 457-3490

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

Individual
Female
Nurse Practitioner
Family

About MARCIA BYRNES

This page provides the complete NPI Profile along with additional information for Marcia Byrnes, a provider established in San Rafael, California with a medical specialization in Nurse Practitioner, focusing in family . The healthcare provider is registered in the NPI registry with number 1801035043 assigned on February 2009. The practitioner's primary taxonomy code is 363LF0000X with license number 18821 (CA). The provider is registered as an individual and her NPI record was last updated 17 years ago.

NPI: 1801035043
Provider Name: MS. MARCIA TUMY BYRNES RN, FNP
Gender: Female
Entity Type: Individual
Location Address: 16 RITTER ST SAN RAFAEL, CA 94901
Location Phone: (415) 457-8182
Location Fax: (415) 457-3490
Mailing Address: 129 BIRCH WAY SAN RAFAEL, CA 94903
Mailing Phone: (415) 847-5300
Mailing Fax: (415) 457-3490
Is Sole Proprietor?: Yes
Enumeration Date: 02-11-2009
Last Update Date: 02-11-2009
Code Navigator

A nurse practitioner (NP) like Marcia Byrnes is an experienced registered nurse with a master’s or doctoral degree and advanced clinical training. Nurse practitioners can work in many different specialties including primary care, pediatrics, cardiology, emergency, women’s health, oncology or geriatrics. Nurse practitioners provide services like physical exams, order laboratory tests, manage diseases, write prescriptions, etc.

Location Map

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: Nurse Practitioner Family
Taxonomy Code: 363LF0000X
Type: Physician Assistants & Advanced Practice Nursing Providers
License No.: 18821
License State: CA

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	163WA2000X	Nursing Service Providers	Registered Nurse Administrator	236717 (CA)
2	163WC1500X	Nursing Service Providers	Registered Nurse Community Health	19099 (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 1801035043, we treat the final digit (3) 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 47. The final step is to find the difference between that total and the next multiple of ten (50 - 47 = 3).

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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

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 0 → 0 0 → 0 5 → 10 → 1 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 0 + 1 + 0 + 3 + 1 + 0 + 0 + 8 + 24 = 47

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

The next multiple of ten after 47 is 50. The difference is the calculated check digit.

50 - 47 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1801035043.