Joseph Chammas, R.PH.
Joseph Chammas, R.PH. is a Pharmacist in Sudbury, MA, registered under NPI 1003035940. 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 Sudbury, based on OpenStreetMap data collected Aug 31, 2026. Parking is available about 577 ft away. A pharmacy sits 0.37 mi from the entrance (Sudbury Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.28 mi away.
Getting here and what is nearby
Restaurant Dunkin' 217 ft ~1 min
Parking 275 ft ~2 min
Parking 465 ft ~2 min
Restaurant Lotus Blossom 540 ft ~3 min
394 Boston Post Road
Parking 577 ft ~3 min
Restaurant Rossini's Pizzeria 0.20 mi ~5 min
418 Boston Post Road, Sudbury
Grocery Formosa Asian Market 0.27 mi ~6 min
Coffee Sudbury Coffee Works 0.28 mi ~6 min
Convenience Mobil Mart 0.29 mi ~6 min
Gas station Mobil 0.29 mi ~6 min
Grocery Roche Brothers 0.36 mi ~8 min
439 Boston Post Road, Sudbury 01776
Pharmacy Sudbury Pharmacy 0.37 mi ~8 min
Gas station Gulf 0.45 mi ~9 min
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 |
|---|---|---|
| 23039 | MA | Pharmacist primary |
This provider holds licence 23039 issued in MA. 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 | 1003035940 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 25, 2007 |
| Last updated | Sep 24, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | R.PH. |
| Practice address |
447 BOSTON POST RD SUDBURY PHARMACY Sudbury, MA 01776 (978) 443-6311 |
| Other identifiers |
23039
· Other (MA) |
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 | 0 | 3 | 5 | 9 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 3 | 1 | 9 | 8 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.