Quick answers
- Does Korey Zellner accept Medicare assignment?
- Yes. Medicare's clinician data says Korey Zellner 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 Korey Zellner see?
- In 2024, CMS data shows 59 Original Medicare patients and 128 services for Korey Zellner. This counts Original Medicare only and measures volume, not quality.
- What is Korey Zellner's NPI number?
- 1699921015. 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 Korey Zellner, 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 | 59 |
|---|---|
| Services billed to Medicare | 128 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)23 services
- Harvest of vein using an endoscope (33508)19 services
- Coronary artery bypass using artery graft, 1 graft (33533)14 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%
- Ischemic heart disease75%
- Diabetes54%
- Atrial fibrillation54%
- Heart failure46%
Hospitals where Korey Zellner works
Medicare's Facility Affiliation Data lists Korey Zellner 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.
- Ascension NE Wisconsin - St Elizabeth CampusAppleton, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520009
- SSM Health St Mary's Hospital - MadisonMadison, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520083
Practice locations
Addresses where Korey Zellner is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.
- 1211 Fish Hatchery RdMadison, WI 53715 (608) 252‑8000
- 1501 S Madison StAppleton, WI 54915 (920) 738‑2000
- 1506 S Oneida StAppleton, WI 54915 (920) 738‑2000
- 1821 S Stoughton RdMadison, WI 53716 (608) 260‑6000
- 515 22nd AveMonroe, WI 53566 (608) 324‑2000
Group practices
Medicare enrollment lists Korey Zellner as a member of these groups (CMS data updated October 2, 2026).
- Dean Health Systems Inc1,159 clinicians in the group
- Ascension Medical Group-Fox Valley Wisconsin, Inc259 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Madison
Clinicians with the same Medicare primary specialty in Madison, WI — not a recommendation.
Other clinicians in Dean Health Systems Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1699921015 |
| 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