Sidney Machefsky, M.D.
Sidney Machefsky, M.D. is a Vascular & Interventional Radiology Physician in St Charles, MO, registered under NPI 1780617050. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 300 FIRST CAPITOL DRIVE, St Charles, MO 63301. 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 |
|---|---|---|
| R8634 | MO | Diagnostic Radiology Physician |
| R8634 | MO | Vascular & Interventional Radiology… |
This provider holds licence R8634 issued in MO. 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 Vascular & Interventional Radiology covers
A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging. NUCC Health Care Provider Taxonomy, code 2085R0204X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2085R0204X | Vascular & Interventional Radiology Physician Vascular & Interventional Radiology | — | IL | primary |
| 2085R0202X | Diagnostic Radiology Physician Diagnostic Radiology | R8634 | MO | |
| 2085R0204X | Vascular & Interventional Radiology Physician Vascular & Interventional Radiology | R8634 | MO | |
| 2085R0202X | Diagnostic Radiology Physician Diagnostic Radiology | — | IL |
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 | 1780617050 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 9, 2006 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
300 FIRST CAPITOL DRIVE St Charles, MO 63301 (636) 947-5444 |
| Mailing address |
220 COMPASS POINT DR Saint Charles, MO 63301 |
| Other identifiers |
P00122213
· Other (IL) |
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 | 7 | 8 | 0 | 6 | 1 | 7 | 0 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 7 | 0 | 3 | 1 | 5 | 0 | 1 |
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.