Roy Chang, PHARM.D.
Roy Chang, PHARM.D. is a Pharmacist in San Antonio, TX, registered under NPI 1003587437.
Getting there
Here is what surrounds this office in San Antonio, based on OpenStreetMap data collected Oct 8, 2026. Parking is available about 873 ft away. The nearest transit stop is 0.30 mi away. A pharmacy sits 0.28 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.32 mi away.
Getting here and what is nearby
Pharmacy Walgreens 57 ft ~1 min
3030 Goliad Road
Mo-Fr 09:00-13:30,14:00-19:00; Sa 09:00-13:30,14:00-17:00; Su off
Restaurant Wingstop 133 ft ~1 min
Gas station Valero 318 ft ~2 min
Convenience Circle K 344 ft ~2 min
Gas station H-E-B Fuel 436 ft ~2 min
3323 Southeast Military Drive, San Antonio
Parking 414 ft ~2 min
Restaurant Burger King 507 ft ~2 min
Restaurant Papa John's 726 ft ~3 min
3322 Southeast Military Drive, San Antonio 78223
Mo-We 09:00-24:00; Th 08:30-24:00; Fr 08:30-01:00; Sa 09:00-01:00; Su 09:00-24:00
Pharmacy H-E-B Pharmacy 797 ft ~4 min
3323 Southeast Military Drive, San Antonio 78223
Mo-Fr 08:00-21:00; Sa 09:00-18:00; Su 10:00-17:00
Parking 867 ft ~4 min
Gas station Sam's Club 874 ft ~4 min
3314 Southeast Military Drive, San Antonio
Mo-Sa 06:00-21:00; Su 08:00-19:00
Hotel La Quinta Inn 894 ft ~4 min
Parking 873 ft ~4 min
Grocery H-E-B 950 ft ~4 min
3323 Southeast Military Drive, San Antonio 78223
06:00-23:00
Hotel Fairfield Inn & Suites 0.22 mi ~5 min
Pharmacy CVS Pharmacy 0.28 mi ~6 min
Transit 0.30 mi ~7 min
Coffee Starbucks 0.32 mi ~7 min
3170 Southeast Military Drive, San Antonio 78223
Hotel Quality Inn & Suites 0.34 mi ~7 min
3602 Southeast Military Drive, San Antonio 78223
Convenience Shell 0.35 mi ~7 min
3533 Southeast Military Drive, San Antonio 78223
Grocery Walmart Supercenter 0.36 mi ~8 min
3302 Southeast Military Drive, San Antonio 78223
06:00-23:00
Convenience Circle K 0.40 mi ~8 min
3603 Southeast Military Drive, San Antonio 78223
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 69434 | TX | Pharmacist primary |
This provider holds licence 69434 issued in TX. 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 Pharmacist covers
An individual licensed by the appropriate state regulatory agency to engage in the practice of pharmacy. The practice of pharmacy includes, but is not limited to, assessment, interpretation, evaluation, and implementation, initiation, monitoring or modification of medication and or medical orders; the compounding or dispensing of medication and or medical orders; participation in drug and device procurement, storage, and selection; drug administration; drug regimen reviews; drug or drug-related research; provision of patient education and the provision of those acts or services necessary to provide medication therapy management services in all areas of patient care. NUCC Health Care Provider Taxonomy, code 183500000X
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 | 1003587437 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 24, 2021 |
| Last updated | Sep 24, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | PHARM.D. |
| Practice address |
3030 GOLIAD RD San Antonio, TX 78223 (210) 359-6949 |
| Mailing address |
20008 LASSEN ST Chatsworth, CA 91311 |
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 | 0 | 0 | 3 | 5 | 8 | 7 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 8 | 5 | 4 | 6 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.