ANN THANH PHAM PA-C
NPI 1821959933
Internal Medicine - Endocrinology, Diabetes & Metabolism in Houston, TX

NPI Status: Active since November 19, 2025

Contact Information

13333 DOTSON RD STE 220
HOUSTON, TX
ZIP 77070
Phone: (281) 251-5234

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

Individual
Female
Internal Medicine
Endocrinology, Diabetes & Metabolism

About ANN PHAM

This page provides the complete NPI Profile along with additional information for Ann Pham, an internist established in Houston, Texas with a medical specialization in Internal Medicine, focusing in endocrinology, diabetes & metabolism . The healthcare provider is registered in the NPI registry with number 1821959933 assigned on November 2025. The practitioner's primary taxonomy code is 207RE0101X with license number PA19771 (TX). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1821959933
Provider Name: ANN THANH PHAM PA-C
Gender: Female
Entity Type: Individual
Location Address: 13333 DOTSON RD STE 220 HOUSTON, TX 77070
Location Phone: (281) 251-5234
Mailing Address: 12527 BRENTLEYWOOD LN HOUSTON, TX 77070
Is Sole Proprietor?: No
Enumeration Date: 11-19-2025
Last Update Date: 11-19-2025
Code Navigator

An internist like Ann Pham is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, 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: Internal Medicine Endocrinology, Diabetes & Metabolism
Taxonomy Code: 207RE0101X
Type: Allopathic & Osteopathic Physicians
License No.: PA19771
License State: TX
Taxonomy Description: An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

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 1821959933, 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 77. The final step is to find the difference between that total and the next multiple of ten (80 - 77 = 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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 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 2 → 4 9 → 18 → 9 9 → 18 → 9 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 4 + 1 + 1 + 8 + 5 + 1 + 8 + 9 + 6 + 24 = 77

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

The next multiple of ten after 77 is 80. The difference is the calculated check digit.

80 - 77 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1821959933.