Willis Ko, MD
Willis Ko, MD is an Interventional Cardiology Physician in Maryville, IL, registered under NPI 1215465307. 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 6810 STATE ROUTE 162 STE 102B, Maryville, IL 62062. 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 |
|---|---|---|
| 036171090 | IL | Interventional Cardiology Physician primary |
| MT213475 | PA | Cardiovascular Disease Physician |
| MT213475 | PA | Internal Medicine Physician |
| 2024024174 | MO | Interventional Cardiology Physician |
Licences are recorded in 3 states: IL, PA, MO. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Interventional Cardiology
- PAC ID
- 3375806102
Medicare enrolment is recorded as approved under the provider type Practitioner - Interventional Cardiology. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 3 states
This provider holds licences in 3 states: Illinois, Missouri and Pennsylvania. The practice address on file is in Maryville, IL, 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
- 036171090
- Specialty
- Interventional Cardiology Physician
- Licence
- 2024024174
- Specialty
- Interventional Cardiology Physician
- Licence
- MT213475
- Specialty
- Cardiovascular Disease Physician
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 Interventional Cardiology covers
An area of medicine within the subspecialty of cardiology, which uses specialized imaging and other diagnostic techniques to evaluate blood flow and pressure in the coronary arteries and chambers of the heart and uses technical procedures and medications to treat abnormalities that impair the function of the cardiovascular system. NUCC Health Care Provider Taxonomy, code 207RI0011X
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 | |
|---|---|---|---|---|
| 207RI0011X | Interventional Cardiology Physician Interventional Cardiology | 036171090 | IL | primary |
| 207RC0000X | Cardiovascular Disease Physician Cardiovascular Disease | MT213475 | PA | |
| 207R00000X | Internal Medicine Physician | MT213475 | PA | |
| 207RI0011X | Interventional Cardiology Physician Interventional Cardiology | 2024024174 | MO |
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 | 1215465307 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 1, 2017 |
| Last updated | Sep 19, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
6810 STATE ROUTE 162 STE 102B Maryville, IL 62062 (618) 288-4076 Fax (618) 288-4215 |
| Mailing address |
660 MASON RIDGE CENTER DR STE 300 Saint Louis, MO 63141 |
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 | 2 | 1 | 5 | 4 | 6 | 5 | 3 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 2 | 5 | 8 | 6 | 1 | 3 | 0 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
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.