Quick answers
- Which hospitals does Mark D. Gideonsen work at?
- Medicare's official clinician data lists Mark D. Gideonsen at 1 hospital: Mayo Clinic Health System Oakridge. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark D. Gideonsen see patients?
- Medicare's clinician data lists 3 practice locations, including Eau Claire, WI, Ashland, WI and Iron River, WI. Call before your visit to confirm the address.
- What is Mark D. Gideonsen's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mark D. Gideonsen accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Gideonsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark D. Gideonsen?
- (534) 200-6165, as listed in official Medicare / NPI Registry data.
- What is Mark D. Gideonsen's NPI number?
- 1841236445. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark D. Gideonsen works
Medicare's Facility Affiliation Data lists Mark D. Gideonsen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mayo Clinic Health System OakridgeOsseo, WI · Critical Access Hospital · CCN 521302
Practice locations
Addresses where Mark D. Gideonsen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1002 W Clairemont AveEau Claire, WI 54701 (534) 200‑6165
- 300 Main St WAshland, WI 54806 (715) 685‑2200
- 7665 US Hwy 2Iron River, WI 54847 (715) 372‑5001
Group practices
Medicare enrollment lists Mark D. Gideonsen as a member of this group (CMS data updated 2026-10-02).
- The Lakes Community Health Center Inc105 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Eau Claire
Clinicians with the same Medicare primary specialty in Eau Claire, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rush Medical College Of Rush University |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1841236445 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians