Quick answers
- Does Michael Theisen accept Medicare assignment?
- Yes. Medicare's clinician data says Michael Theisen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Michael Theisen see?
- In 2024, CMS data shows 48 Original Medicare patients and 49 services for Michael Theisen. This counts Original Medicare only and measures volume, not quality.
- What is Michael Theisen's NPI number?
- 1134167943. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Michael Theisen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 48 |
|---|---|
| Services billed to Medicare | 49 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Anesthesia for retinal surgery (00145)26 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure73%
- Arthritis52%
- Diabetes31%
- Heart failure27%
- Ischemic heart disease25%
Hospitals where Michael Theisen works
Medicare's Facility Affiliation Data lists Michael Theisen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mayo Clinic Health System Eau Claire HospitalEau Claire, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520070
Practice locations
Addresses where Michael Theisen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1400 Bellinger StEau Claire, WI 54703 (715) 838‑5222
- 415 Adams AveScranton, PA 18510 (570) 770‑5460
- 4707 S 19th St, Lowr LevelTacoma, WA 98405 (253) 248‑2020
Group practices
Medicare enrollment lists Michael Theisen as a member of these groups (CMS data updated October 2, 2026).
- Mayo Clinic Health System-Northwest Wisconsin Region Inc802 clinicians in the group
- 360 Anesthesia PLLC113 clinicians in the group
- Narrows Surgery Center PS2 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Eau Claire
Clinicians with the same Medicare primary specialty in Eau Claire, WI — not a recommendation.
Other clinicians in Mayo Clinic Health System-Northwest Wisconsin Region Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Washington School Of Medicine |
| Graduation year | 1979 (47 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134167943 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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