Joseph Sliwkowski, MD
Joseph Sliwkowski, MD is a Sports Medicine (Preventive Medicine) Physician in Marlborough, MA, registered under NPI 1861452294. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 5 MOUNT ROYAL AVE, Marlborough, MA 01752. 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 |
|---|---|---|
| 74311 | MA | Sports Medicine (Preventive Medicine)… primary |
| 01051636A | IN | Family Medicine Physician |
| 01051636A | IN | Occupational Medicine Physician |
Licences are recorded in 2 states: MA, IN. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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.
Licensed in 2 states
This provider holds licences in 2 states: Indiana and Massachusetts. The practice address on file is in Marlborough, MA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 74311
- Specialty
- Sports Medicine (Preventive Medicine)…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Sports Medicine covers
A preventive medicine physician who specializes in the diagnosis and treatment of sports related conditions and injuries. NUCC Health Care Provider Taxonomy, code 2083S0010X
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 | |
|---|---|---|---|---|
| 2083S0010X | Sports Medicine (Preventive Medicine) Physician Sports Medicine | 74311 | MA | primary |
| 207Q00000X | Family Medicine Physician | 01051636A | IN | |
| 2083X0100X | Occupational Medicine Physician Occupational Medicine | 01051636A | IN |
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 | 1861452294 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 28, 2006 |
| Last updated | Feb 28, 2011 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
5 MOUNT ROYAL AVE Marlborough, MA 01752 (508) 251-7262 Fax (508) 251-7265 |
| Other identifiers |
000000528705
· Other (IN) 200264480 · Medicaid (IN) |
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 | 6 | 1 | 4 | 5 | 2 | 2 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 3 | 1 | 8 | 5 | 4 | 2 | 9 |
Sum = 66 · next multiple of 10 = 70 · check digit = 4 · actual last digit = 4
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.