Quick answers
- Does Kevin R. Kozak accept Medicare assignment?
- Yes. Medicare's clinician data says Kevin R. Kozak 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 Kevin R. Kozak see?
- In 2024, CMS data shows 223 Original Medicare patients and 2,050 services for Kevin R. Kozak. This counts Original Medicare only and measures volume, not quality.
- What is Kevin R. Kozak's NPI number?
- 1124219241. 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 Kevin R. Kozak, 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 | 223 |
|---|---|
| Services billed to Medicare | 2,050 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)760 services
- Calculation of radiation therapy dose (77300)246 services
- Radiation treatment management, 5 treatment sessions (77427)223 services
- Design and construction of complex radiation treatment device (77334)189 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)142 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%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- High blood pressure70%
- Arthritis35%
- Diabetes28%
- Depression27%
Hospitals where Kevin R. Kozak works
Medicare's Facility Affiliation Data lists Kevin R. Kozak 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.
- Javon Bea HospitalRockford, IL · Acute Care Hospital · closed, according to its website · CCN 140239
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520066
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 521357
- SSM Health St Clare Hospital - BarabooBaraboo, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520057
Practice locations
Addresses where Kevin R. Kozak is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1000 Mineral Point AveJanesville, WI 53548
- 1104 John Nolen Dr, Suite 1Madison, WI 53713 (608) 251‑6868
- 2400 N Rockton AveRockford, IL 61103 (815) 971‑5000
- 3400 E Racine StJanesville, WI 53546 (608) 373‑8500
- 875 S Route 31Crystal Lake, IL 60014 (779) 220‑5500
Group practices
Medicare enrollment lists Kevin R. Kozak as a member of these groups (CMS data updated October 2, 2026).
- Mercy Health System Corporation753 clinicians in the group
- Rockford Health Physicians521 clinicians in the group
- Shared Magnetic Resonance Imaging Facility Inc10 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Other clinicians in Mercy Health System Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Vanderbilt University School Of Medicine |
| Graduation year | 2003 (23 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) | 1124219241 |
| 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