Greg Simas, PHARMD MBA
Greg Simas, PHARMD MBA is a Pharmacist in Rancho Cucamonga, CA, registered under NPI 1003278383. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Rancho Cucamonga, based on OpenStreetMap data collected Sep 15, 2026. Parking is available about 527 ft away. There is EV charging 0.46 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.36 mi away, served by Omni.
Getting here and what is nearby
Parking 339 ft ~2 min
Parking 435 ft ~2 min
Parking 527 ft ~2 min
Hotel Residence Inn by Marriott Ontario Rancho Cucamonga 0.32 mi ~7 min
Transit Omni 0.35 mi ~8 min
Transit Omni 0.36 mi ~8 min
Transit Omni 0.36 mi ~8 min
Restaurant Subway 0.41 mi ~9 min
9280 Haven Avenue, Rancho Cucamonga 91730
Mo-Fr 07:00-22:00
Restaurant Farmer Boys 0.42 mi ~9 min
Haven Ave, Rancho Cucamonga 91730
Convenience Speedway 0.43 mi ~9 min
Restaurant Jimmy John's 0.43 mi ~9 min
Convenience 7-Eleven 0.45 mi ~9 min
Gas station Speedway 0.45 mi ~9 min
EV charging Tesla Supercharger 0.46 mi ~10 min
Gas station 7-Eleven 0.46 mi ~10 min
990 North Haven Avenue, Ontario 91764
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 |
|---|---|---|
| 40277 | CA | Pharmacist primary |
This provider holds licence 40277 issued in CA. 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 | 1003278383 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 24, 2016 |
| Last updated | Mar 24, 2016 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | PHARMD MBA |
| Practice address |
10801 6TH ST SUITE 120 Rancho Cucamonga, CA 91730 (951) 335-3530 |
| Mailing address |
PO BOX 1800 Rancho Cucamonga, CA 91729 |
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 | 2 | 7 | 8 | 3 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 7 | 7 | 3 | 7 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.