Justin Chen, PHARMD
Justin Chen, PHARMD is a Solid Organ Transplant Pharmacist in Atlanta, GA, registered under NPI 1639054521.
Getting there
The practice address on file is 2220 N DRUID HILLS RD NE, Atlanta, GA 30329. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| RPH028603 | GA | Solid Organ Transplant Pharmacist primary |
This provider holds licence RPH028603 issued in GA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Solid Organ Transplant covers
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. NUCC Health Care Provider Taxonomy, code 1835S0206X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1639054521 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 8, 2025 |
| Last updated | Aug 8, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | PHARMD |
| Practice address |
2220 N DRUID HILLS RD NE Atlanta, GA 30329 (404) 785-5437 |
| Mailing address |
2490 CANNING VIEW AVE Lawrenceville, GA 30044 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 6 | 3 | 9 | 0 | 5 | 4 | 5 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 6 | 9 | 0 | 5 | 8 | 5 | 4 |
Sum = 69 · next multiple of 10 = 70 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.