MR. CHRISTOPHER MING TANG MD
NPI 1669669354
Preventive Medicine - Occupational Medicine in Long Beach, CA

NPI Status: Active since September 27, 2007

Contact Information

1250 PACIFIC AVE
LONG BEACH, CA
ZIP 90813
Phone: (562) 437-0831
Fax: (562) 628-9390

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

Individual
Male
Preventive Medicine
Occupational Medicine

About CHRISTOPHER TANG

This page provides the complete NPI Profile along with additional information for Christopher Tang, a provider established in Long Beach, California with a medical specialization in Preventive Medicine, focusing in occupational medicine . The healthcare provider is registered in the NPI registry with number 1669669354 assigned on September 2007. The practitioner's primary taxonomy code is 2083X0100X with license number A98921 (CA). The provider is registered as an individual and his NPI record was last updated 4 years ago.

NPI: 1669669354
Provider Name: MR. CHRISTOPHER MING TANG MD
Gender: Male
Entity Type: Individual
Location Address: 1250 PACIFIC AVE LONG BEACH, CA 90813
Location Phone: (562) 437-0831
Location Fax: (562) 628-9390
Mailing Address: PO BOX 16149 LONG BEACH, CA 90813
Mailing Phone: (562) 437-0831
Mailing Fax: (562) 628-9390
Is Sole Proprietor?: No
Enumeration Date: 09-27-2007
Last Update Date: 11-10-2022
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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: Preventive Medicine Occupational Medicine
Taxonomy Code: 2083X0100X
Type: Allopathic & Osteopathic Physicians
License No.: A98921
License State: CA
Taxonomy Description: Occupational medicine focuses on the health of workers, including the ability to perform work; the physical, chemical, biological, and social environments of the workplace; and the health outcomes of environmental exposures. Practitioners in this field address the promotion of health in the work place, and the prevention and management of occupational and environmental injury, illness, and disability.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No.	Taxonomy Code	Type	Classification / Specialization	License No. (State)
1	207R00000X	Allopathic & Osteopathic Physicians	Internal Medicine	A98921 (CA)

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 1669669354, we treat the final digit (4) 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 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).

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 → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 12 → 1 + 2

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

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 6 → 12 → 3 6 → 12 → 3 9 → 18 → 9 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 + 2 + 9 + 1 + 2 + 6 + 1 + 8 + 3 + 1 + 0 + 24 = 66

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

The next multiple of ten after 66 is 70. The difference is the calculated check digit.

70 - 66 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1669669354.