Quick answers
- Does Joan L. Kortbein accept Medicare assignment?
- Yes. Medicare's clinician data says Joan L. Kortbein 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 Joan L. Kortbein see?
- In 2024, CMS data shows 93 Original Medicare patients and 280 services for Joan L. Kortbein. This counts Original Medicare only and measures volume, not quality.
- What is Joan L. Kortbein's NPI number?
- 1245236538. 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 Joan L. Kortbein, 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 | 93 |
|---|---|
| Services billed to Medicare | 280 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Diabetes outpatient self-management training services, individual, per 30 minutes (G0108)206 services
- Therapy procedure reassessment for nutrition management, each 15 minutes (97803)41 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%
- Diabetes75%
- Chronic kidney disease59%
- Ischemic heart disease30%
- Depression30%
Practice locations
Addresses where Joan L. Kortbein is enrolled with Medicare (CMS data updated October 2, 2026).
- 1111 W Wisconsin StSparta, WI 54656 (608) 269‑6731
- 402 A W Lake StFriendship, WI 53934 (608) 339‑8471
- 402 W Lake StFriendship, WI 53934 (608) 339‑3331
- 505 Gopher DrTomah, WI 54660 (608) 372‑4111
Group practices
Medicare enrollment lists Joan L. Kortbein as a member of this group (CMS data updated October 2, 2026).
- Gundersen Clinic Ltd418 clinicians in the group
Specialties
Find other clinicians: Registered Dietitian or Nutrition Professional, Wisconsin →
Other dietitians in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Other clinicians in Gundersen Clinic Ltd
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MNT |
|---|---|
| School | University Of Wisconsin School Of Medicine |
| Graduation year | 1990 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1245236538 |
| 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
- 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