DR. CATHERINE TERESA BYRNES DO
NPI 1679401558
Pediatrics in Wilmington, DE

NPI Status: Active since May 12, 2026

Contact Information

1600 ROCKLAND RD STE 3D16
WILMINGTON, DE
ZIP 19803
Phone: (302) 651-5874
Fax: (302) 651-5954

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

Table of Contents

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

Individual
Female
Pediatrics

About CATHERINE BYRNES

This page provides the complete NPI Profile along with additional information for Catherine Byrnes, a pediatrician established in Wilmington, Delaware with a medical specialization in Pediatrics. The healthcare provider is registered in the NPI registry with number 1679401558 assigned on May 2026. The practitioner's primary taxonomy code is 208000000X with license number C7-0019325 (DE). The provider is registered as an individual and her NPI record was last updated May 2026.

NPI: 1679401558
Provider Name: DR. CATHERINE TERESA BYRNES DO
Gender: Female
Entity Type: Individual
Location Address: 1600 ROCKLAND RD STE 3D16 WILMINGTON, DE 19803
Location Phone: (302) 651-5874
Location Fax: (302) 651-5954
Mailing Address: 1600 ROCKLAND RD STE 3D16 WILMINGTON, DE 19803
Mailing Phone: (302) 651-5874
Mailing Fax: (302) 651-5954
Is Sole Proprietor?: No
Enumeration Date: 05-12-2026
Last Update Date: 05-12-2026
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A pediatrician like Catherine Byrnes is a physician who has completed a pediatric residency and is board-certified or board-eligible in a pediatric specialty. Pediatric care providers are trained to care for newborns, infants, children and adolescents. A pediatrician could perform physical exams, manage vaccinations, monitor development milestones, diagnose illnesses, infections, injuries or other health problems, etc.

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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: Pediatrics
Taxonomy Code: 208000000X
Type: Allopathic & Osteopathic Physicians
License No.: C7-0019325
License State: DE
Taxonomy Description: A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

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 1679401558, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).

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 → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

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 7 → 14 → 5 4 → 8 1 → 2 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 1 + 4 + 9 + 8 + 0 + 2 + 5 + 1 + 0 + 24 = 62

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

The next multiple of ten after 62 is 70. The difference is the calculated check digit.

70 - 62 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1679401558.