DR. JUSTIN KAI-PAN CHEN PHARMD
NPI 1639054521
Pharmacist - Solid Organ Transplant in Atlanta, GA

NPI Status: Active since August 08, 2025

Contact Information

2220 N DRUID HILLS RD NE
ATLANTA, GA
ZIP 30329
Phone: (404) 785-5437

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

Individual
Male
Pharmacist
Solid Organ Transplant

About JUSTIN CHEN

This page provides the complete NPI Profile along with additional information for Justin Chen, a provider established in Atlanta, Georgia with a medical specialization in Pharmacist, focusing in solid organ transplant . The healthcare provider is registered in the NPI registry with number 1639054521 assigned on August 2025. The practitioner's primary taxonomy code is 1835S0206X with license number RPH028603 (GA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1639054521
Provider Name: DR. JUSTIN KAI-PAN CHEN PHARMD
Gender: Male
Entity Type: Individual
Location Address: 2220 N DRUID HILLS RD NE ATLANTA, GA 30329
Location Phone: (404) 785-5437
Mailing Address: 2490 CANNING VIEW AVE LAWRENCEVILLE, GA 30044
Mailing Phone: (217) 502-2517
Is Sole Proprietor?: No
Enumeration Date: 08-08-2025
Last Update Date: 08-08-2025
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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: Pharmacist Solid Organ Transplant
Taxonomy Code: 1835S0206X
Type: Pharmacy Service Providers
License No.: RPH028603
License State: GA
Taxonomy Description: A licensed pharmacist who has demonstrated specialized knowledge and skill delivering direct patient care and the safe and effective use of medications for patients in all phases of solid organ transplantation.

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 1639054521, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).

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 → 0

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 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 3 → 6 0 → 0 4 → 8 2 → 4

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 6 + 9 + 0 + 5 + 8 + 5 + 4 + 24 = 69

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

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1639054521.