DR. ADRIAN C TSANG MD
NPI 1033782636
Ophthalmology - Uveitis and Ocular Inflammatory Disease in San Francisco, CA

NPI Status: Active since July 21, 2021

Contact Information

490 ILLINOIS ST
SAN FRANCISCO, CA
ZIP 94158
Phone: (415) 514-0793

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

Individual
Male
Ophthalmology
Uveitis and Ocular Inflammatory Disease

About ADRIAN TSANG

This page provides the complete NPI Profile along with additional information for Adrian Tsang, a provider established in San Francisco, California with a medical specialization in Ophthalmology, focusing in uveitis and ocular inflammatory disease . The healthcare provider is registered in the NPI registry with number 1033782636 assigned on July 2021. The practitioner's primary taxonomy code is 207WX0108X with license number 2055427 (CA). The provider is registered as an individual and his NPI record was last updated 5 years ago. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization.

NPI: 1033782636
Provider Name: DR. ADRIAN C TSANG MD
Gender: Male
Entity Type: Individual
Location Address: 490 ILLINOIS ST SAN FRANCISCO, CA 94158
Location Phone: (415) 514-0793
Mailing Address: 600 MINNESOTA ST APT 557 SAN FRANCISCO, CA 94107
Mailing Phone: (415) 309-5709
Is Sole Proprietor?: Yes
Enumeration Date: 07-21-2021
Last Update Date: 07-21-2021
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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 Uveitis and Ocular Inflammatory Disease
Taxonomy Code: 207WX0108X
Type: Allopathic & Osteopathic Physicians
License No.: 2055427
License State: CA
Taxonomy Description: An ophthalmologist who specializes in the treatment of intraocular inflammation, scleritis, keratitis and infectious disorders affecting the eye and inflammatory disorders of the adnexa and/or orbit.

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

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 1033782636, we treat the final digit (6) 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 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 6).

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 → 6

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 4

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 3 → 6 7 → 14 → 5 2 → 4 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 6 + 3 + 1 + 4 + 8 + 4 + 6 + 6 + 24 = 64

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

The next multiple of ten after 64 is 70. The difference is the calculated check digit.

70 - 64 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1033782636.