William Probasco, M.D., M.S.
William Probasco, M.D., M.S. is an Orthopaedic Foot and Ankle Surgery Physician in Fairfield, CT, registered under NPI 1336503382.
Getting there
The practice address on file is 305 BLACK ROCK TPKE, Fairfield, CT 06825. 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 |
|---|---|---|
| 69667 | CT | Orthopaedic Foot and Ankle Surgery… primary |
| D91392 | MD | Orthopaedic Foot and Ankle Surgery… |
Licences are recorded in 2 states: CT, MD. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Orthopedic Surgery
- PAC ID
- 6103229141
- Enrollment ID
- I20220817003654
Medicare enrolment is recorded as approved under the provider type Practitioner - Orthopedic Surgery. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: Connecticut and Maryland. The practice address on file is in Fairfield, CT, 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
- 69667
- Specialty
- Orthopaedic Foot and Ankle Surgery…
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 Foot and Ankle Surgery covers
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, foot and ankle surgeons deal with adult reconstructive foot and ankle surgery, adult foot and ankle trauma, sports medicine foot and ankle, and children's foot and ankle reconstructive surgery. NUCC Health Care Provider Taxonomy, code 207XX0004X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207XX0004X | Orthopaedic Foot and Ankle Surgery Physician Foot and Ankle Surgery | 69667 | CT | primary |
| 207XX0004X | Orthopaedic Foot and Ankle Surgery Physician Foot and Ankle Surgery | D91392 | MD |
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 | 1336503382 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 6, 2016 |
| Last updated | Oct 3, 2022 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D., M.S. |
| Practice address |
305 BLACK ROCK TPKE Fairfield, CT 06825 (203) 337-2600 Fax (203) 337-2611 |
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 | 3 | 3 | 6 | 5 | 0 | 3 | 3 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 3 | 6 | 6 | 1 | 0 | 6 | 3 | 7 |
Sum = 58 · next multiple of 10 = 60 · check digit = 2 · actual last digit = 2
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.