Quick answers
- Does Mark R. Fesen accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Fesen 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 R. Fesen see?
- In 2024, CMS data shows 672 Original Medicare patients and 266,957 services for Mark R. Fesen. This counts Original Medicare only and measures volume, not quality.
- What is Mark R. Fesen's NPI number?
- 1639149545. 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 R. Fesen, 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 | 672 |
|---|---|
| Services billed to Medicare | 266,957 |
| Different services or procedures | 130 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, filgrastim-ayow, biosimilar, (releuko), 1 microgram (Q5125)109,620 services
- Injection, pembrolizumab, 1 mg (J9271)18,600 services
- Injection, paclitaxel, 1 mg (J9267)7,686 services
- Injection, immune globulin, (gammagard liquid), non-lyophilized, (e.g., liquid), 500 mg (J1569)6,900 services
- Injection, dexamethasone sodium phosphate, 1 mg (J1100)5,715 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 cholesterol70%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)51%
- Arthritis47%
- Ischemic heart disease34%
- Chronic kidney disease32%
Hospitals where Mark R. Fesen works
Medicare's Facility Affiliation Data lists Mark R. Fesen 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.
- Clara Barton HospitalHoisington, KS · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 171333
- Ellsworth County Medical CenterEllsworth, KS · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 171327
- Pawnee Valley Community HospitalLarned, KS · Critical Access Hospital · Emergency services: listed by Medicare · CCN 171345
- Rush County Memorial HospitalLa Crosse, KS · Rural Emergency Hospital · Emergency services: listed by Medicare · CCN 170781
- University of KS Health System Great Bend CampusGreat Bend, KS · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 170191
Practice locations
Addresses where Mark R. Fesen is enrolled with Medicare (CMS data updated October 2, 2026).
- 204 Cleveland StGreat Bend, KS 67530 (620) 792‑5511
Group practices
Medicare enrollment lists Mark R. Fesen as a member of this group (CMS data updated October 2, 2026).
- Central Care PA15 clinicians in the group
Specialties
- Medical Oncologyprimary
Other oncologists in Kansas
Clinicians with the same Medicare primary specialty in Kansas — not a recommendation.
Other clinicians in Central Care PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rutgers New Jersey Medical School |
| Graduation year | 1987 (39 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1639149545 |
| 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