MDSA LLC
MDSA LLC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1871839530, based in Methuen, MA. The organization lists 3 taxonomy classifications, with Periodontics recorded as primary.
Getting there
The practice address on file is 380 MERRIMACK ST SUITE 3A, Methuen, MA 01844. 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 |
|---|---|---|
| DN16836 | MA | Endodontics |
| 16114 | MA | Orthodontics and Dentofacial Orthopedics… |
| DN20469 | MA | Periodontics primary |
This provider holds licence DN16836 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 Periodontics covers
That specialty of dentistry which encompasses the prevention, diagnosis and treatment of diseases of the supporting and surrounding tissues of the teeth or their substitutes and the maintenance of the health, function and esthetics of these structures and tissues. NUCC Health Care Provider Taxonomy, code 1223P0300X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 1223E0200X | Endodontics Endodontics | DN16836 | MA | |
| 1223X0400X | Orthodontics and Dentofacial Orthopedics Dentistry Orthodontics and Dentofacial Orthopedics | 16114 | MA | |
| 1223P0300X | Periodontics Periodontics | DN20469 | MA | primary |
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1871839530 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Dec 27, 2012 |
| Last updated | Dec 27, 2012 |
| Status | Active |
| Practice address |
380 MERRIMACK ST SUITE 3A Methuen, MA 01844 (978) 685-2471 Fax (978) 683-3985 |
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 | 8 | 7 | 1 | 8 | 3 | 9 | 5 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 5 | 1 | 7 | 3 | 9 | 5 | 6 |
Sum = 70 · next multiple of 10 = 70 · 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.