MR. CHRISTOPHER CHING-HANG CHEUNG M.D.
NPI 1669094074
Internal Medicine - Cardiovascular Disease in San Francisco, CA

NPI Status: Active since May 08, 2020

Contact Information

400 PARNASSUS AVE FL 5
SAN FRANCISCO, CA
ZIP 94143
Phone: (415) 502-1115

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

Individual
Male
Internal Medicine
Cardiovascular Disease

About CHRISTOPHER CHEUNG

This page provides the complete NPI Profile along with additional information for Christopher Cheung, an internist established in San Francisco, California with a medical specialization in Internal Medicine, focusing in cardiovascular disease . The healthcare provider is registered in the NPI registry with number 1669094074 assigned on May 2020. The practitioner's primary taxonomy code is 207RC0000X with license number A169340 (CA). The provider is registered as an individual and his NPI record was last updated 4 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: 1669094074
Provider Name: MR. CHRISTOPHER CHING-HANG CHEUNG M.D.
Gender: Male
Entity Type: Individual
Location Address: 400 PARNASSUS AVE FL 5 SAN FRANCISCO, CA 94143
Location Phone: (415) 502-1115
Mailing Address: 1155 4TH STREET APT 502 SAN FRANCISCO, CA 94158
Mailing Phone: (415) 535-7288
Is Sole Proprietor?: Yes
Enumeration Date: 05-08-2020
Last Update Date: 03-25-2022
Code Navigator

An internist like Christopher Cheung 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 Cardiovascular Disease
Taxonomy Code: 207RC0000X
Type: Allopathic & Osteopathic Physicians
License No.: A169340
License State: CA
Taxonomy Description: An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

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	207RC0000X	Allopathic & Osteopathic Physicians	Internal Medicine Cardiovascular Disease	29994 (ZZ)

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 1669094074, 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 → 0

Pos 6

Unchanged

Pos 7

Doubled → 8

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 6 → 12 → 3 0 → 0 4 → 8 7 → 14 → 5

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 + 0 + 9 + 8 + 0 + 1 + 4 + 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 1669094074.