MAYO CLINIC HEALTH SYSTEM-NORTHWEST WISCONSIN REGION, INC.
MAYO CLINIC HEALTH SYSTEM-NORTHWEST WISCONSIN REGION, INC. is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1235588831, based in Eau Claire, WI. The organization lists 4 taxonomy classifications, with Multi-Specialty Clinic/Center recorded as primary.
Getting there
The practice address on file is 733 W CLAIREMONT AVE, Eau Claire, WI 54701. 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
- Status
- Approved
- Provider type
- Part B Supplier - Clinic/group Practice
- PAC ID
- 4385553627
Enrolled in Medicare 4 times, across 4 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Wisconsin | O20161109002075 | Part B Supplier - Clinic/group Practice |
| Minnesota | O20170522002864 | Part B Supplier - Clinic/group Practice |
| Arizona | O20170710001051 | Part B Supplier - Clinic/group Practice |
| Florida | O20180921001600 | Part B Supplier - Clinic/group Practice |
Medicare enrolment is recorded as approved under the provider type Part B Supplier - Clinic/group Practice. There are 4 separate enrolment records across 4 states (WI, MN, AZ, FL). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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.
What Multi-Specialty covers
Definition to come... NUCC Health Care Provider Taxonomy, code 261QM1300X
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 | |
|---|---|---|---|---|
| 261QM1300X | Multi-Specialty Clinic/Center Multi-Specialty | — | — | primary |
| 156FX1800X | Optician Optician | — | — | |
| 207V00000X | Obstetrics & Gynecology Physician | — | — | |
| 261QM0801X | Mental Health Clinic/Center (Including Community Mental Health Center) Mental Health (Including Community Mental Health Center) | — | — |
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 | 1235588831 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Jun 6, 2016 |
| Last updated | Apr 15, 2026 |
| Status | Active |
| Practice address |
733 W CLAIREMONT AVE Eau Claire, WI 54701 (715) 838-5222 |
| Mailing address |
1221 WHIPPLE ST Eau Claire, WI 54703 |
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 | 3 | 5 | 5 | 8 | 8 | 8 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 6 | 5 | 1 | 8 | 7 | 8 | 6 |
Sum = 69 · next multiple of 10 = 70 · check digit = 1 · actual last digit = 1
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.