Quick answers
- Does Mark F. Buettner accept Medicare assignment?
- Yes. Medicare's clinician data says Mark F. Buettner 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 Mark F. Buettner see?
- In 2024, CMS data shows 168 Original Medicare patients and 300 services for Mark F. Buettner. This counts Original Medicare only and measures volume, not quality.
- What is Mark F. Buettner's NPI number?
- 1861474421. 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 Mark F. Buettner, 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 | 168 |
|---|---|
| Services billed to Medicare | 300 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Emergency department visit with moderate level of medical decision making (99284)64 services
- Emergency department visit with high level of medical decision making (99285)44 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)38 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)28 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)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 blood pressure75%
- High cholesterol75%
- Arthritis45%
- Ischemic heart disease42%
- Chronic kidney disease34%
- Heart failure32%
Hospitals where Mark F. Buettner works
Medicare's Facility Affiliation Data lists Mark F. Buettner 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.
- Greene County Medical CenterJefferson, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161325
- St Lukes Regional Medical CenterSioux City, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160146
Practice locations
Addresses where Mark F. Buettner is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 W Lincoln WayJefferson, IA 50129 (515) 386‑2114
- 801 5th StSioux City, IA 51101 (712) 279‑2010
Group practices
Medicare enrollment lists Mark F. Buettner as a member of these groups (CMS data updated October 2, 2026).
- Woodbury Emergency Group, PC17 clinicians in the group
- Seven Hills Emergency Group PC7 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Jefferson
Clinicians with the same Medicare primary specialty in Jefferson, IA — not a recommendation.
Other clinicians in Woodbury Emergency Group, PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Oklahoma State University College Of Osteopathic Medicine |
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1861474421 |
| 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