BILL WAYNE CHAN MD
NPI 1255073706
Emergency Medicine in San Diego, CA

NPI Status: Active since April 13, 2022

Contact Information

200 W ARBOR DR # MC8676
SAN DIEGO, CA
ZIP 92103
Phone: (619) 543-6213

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

Individual
Male
Emergency Medicine

About BILL CHAN

This page provides the complete NPI Profile along with additional information for Bill Chan, a provider established in San Diego, California with a medical specialization in Emergency Medicine. The healthcare provider is registered in the NPI registry with number 1255073706 assigned on April 2022. The practitioner's primary taxonomy code is 207P00000X with license number 10045 (CA). The provider is registered as an individual and his NPI record was last updated 3 years ago.

NPI: 1255073706
Provider Name: BILL WAYNE CHAN MD
Gender: Male
Entity Type: Individual
Location Address: 200 W ARBOR DR # MC8676 SAN DIEGO, CA 92103
Location Phone: (619) 543-6213
Mailing Address: 200 W ARBOR DR # MC8676 SAN DIEGO, CA 92103
Mailing Phone: (619) 543-6213
Is Sole Proprietor?: No
Enumeration Date: 04-13-2022
Last Update Date: 03-06-2023
Code Navigator

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: Emergency Medicine
Taxonomy Code: 207P00000X
Type: Allopathic & Osteopathic Physicians
License No.: 10045
License State: CA
Taxonomy Description: An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

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 1255073706, 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 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 5 → 10 → 1 0 → 0 3 → 6 0 → 0

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 1 + 0 + 5 + 0 + 7 + 6 + 7 + 0 + 24 = 54

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

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1255073706.