Quick answers
- Where does Sierra E. Loncki see patients?
- Medicare's clinician data lists 1 practice location in Sparta, WI. Call before your visit to confirm the address.
- What is Sierra E. Loncki's specialty?
- Medicare lists Registered Dietitian or Nutrition Professional as the primary specialty.
- Does Sierra E. Loncki accept Medicare assignment?
- Yes. Medicare's clinician data says Sierra E. Loncki accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Sierra E. Loncki?
- (608) 269-6731, as listed in official Medicare / NPI Registry data.
- What is Sierra E. Loncki's NPI number?
- 1679209498. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Sierra E. Loncki is enrolled with Medicare (CMS data updated 2026-10-02).
- 1111 W Wisconsin StSparta, WI 54656 (608) 269‑6731
Group practices
Medicare enrollment lists Sierra E. Loncki as a member of this group (CMS data updated 2026-10-02).
- 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.
Clinician information
| Graduation year | 2022 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1679209498 |
| 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 2026-10-02, retrieved 2026-10-29
- 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