MARIALEJANDRA DIAZ IBARRA MD
NPI 1851031173
Ophthalmology - Retina Specialist in Mission Viejo, CA

NPI Status: Active since April 01, 2022

Contact Information

26732 CROWN VALLEY PKWY STE 351
MISSION VIEJO, CA
ZIP 92691
Phone: (949) 642-3100

Recently Updated NPI Information
Some details in this NPI profile have been updated in 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
Ophthalmology
Retina Specialist

About MARIALEJANDRA DIAZ IBARRA

This page provides the complete NPI Profile along with additional information for Marialejandra Diaz Ibarra, a provider established in Mission Viejo, California with a medical specialization in Ophthalmology, focusing in retina specialist . The healthcare provider is registered in the NPI registry with number 1851031173 assigned on April 2022. The practitioner's primary taxonomy code is 207WX0107X with license number A197533 (CA). The provider is registered as an individual and her NPI record was last updated June 2026.

NPI: 1851031173
Provider Name: MARIALEJANDRA DIAZ IBARRA MD
Gender: Female
Entity Type: Individual
Location Address: 26732 CROWN VALLEY PKWY STE 351 MISSION VIEJO, CA 92691
Location Phone: (949) 642-3100
Mailing Address: 14726 RAMONA AVE STE 203 CHINO, CA 91710
Mailing Phone: (626) 305-9100
Mailing Fax
Is Sole Proprietor?: No
Enumeration Date: 04-01-2022
Last Update Date: 06-11-2026
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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: Ophthalmology Retina Specialist
Taxonomy Code: 207WX0107X
Type: Allopathic & Osteopathic Physicians
License No.: A197533
License State: CA
Taxonomy Description: An ophthalmologist who specializes in the diagnosis and treatment of vitreoretinal diseases.

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 1851031173, 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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 14 → 1 + 4

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 0 → 0 1 → 2 7 → 14 → 5

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 1 + 0 + 1 + 0 + 3 + 2 + 1 + 1 + 4 + 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 1851031173.