ABIGAIL LANGAN MD
NPI 1154546299
Psychiatry & Neurology - Child & Adolescent Psychiatry in Katy, TX

NPI Status: Active since April 16, 2007

Contact Information

24285 KATY FWY STE 300
KATY, TX
ZIP 77494
Phone: (832) 405-4660

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

Individual
Female
Psychiatry & Neurology
Child & Adolescent Psychiatry

About ABIGAIL LANGAN

This page provides the complete NPI Profile along with additional information for Abigail Langan, a provider established in Katy, Texas with a medical specialization in Psychiatry & Neurology, focusing in child & adolescent psychiatry . The healthcare provider is registered in the NPI registry with number 1154546299 assigned on April 2007. The practitioner's primary taxonomy code is 2084P0804X with license number T6907 (TX). The provider is registered as an individual and her NPI record was last updated January 2026.

NPI: 1154546299
Provider Name: ABIGAIL LANGAN MD
Gender: Female
Entity Type: Individual
Location Address: 24285 KATY FWY STE 300 KATY, TX 77494
Location Phone: (832) 405-4660
Mailing Address: 577 1ST AVE NEW YORK, NY 10016
Mailing Phone: (212) 263-6567
Is Sole Proprietor?: No
Enumeration Date: 04-16-2007
Last Update Date: 01-05-2026
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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: Psychiatry & Neurology Child & Adolescent Psychiatry
Taxonomy Code: 2084P0804X
Type: Allopathic & Osteopathic Physicians
License No.: T6907
License State: TX
Taxonomy Description: Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.

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 1154546299, 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 51. The final step is to find the difference between that total and the next multiple of ten (60 - 51 = 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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 12 → 1 + 2

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 5 → 10 → 1 6 → 12 → 3 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 1 + 0 + 4 + 1 + 0 + 4 + 1 + 2 + 2 + 1 + 8 + 24 = 51

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

The next multiple of ten after 51 is 60. The difference is the calculated check digit.

60 - 51 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1154546299.