Quick answers
- Where does William A. Grosdidier see patients?
- Medicare's clinician data lists 2 practice locations, including Altoona, WI and Rice Lake, WI. Call before your visit to confirm the address.
- What is William A. Grosdidier's specialty?
- Medicare lists Oral Surgery as the primary specialty.
- Does William A. Grosdidier accept Medicare assignment?
- Yes. Medicare's clinician data says William A. Grosdidier 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 William A. Grosdidier?
- (715) 834-8414, as listed in official Medicare / NPI Registry data.
- What is William A. Grosdidier's NPI number?
- 1447605886. 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 William A. Grosdidier is enrolled with Medicare (CMS data updated 2026-10-02).
- 788 Oakleaf WayAltoona, WI 54720 (715) 834‑8414
- 821 Bear Paw AveRice Lake, WI 54868 (715) 834‑8414
Group practices
Medicare enrollment lists William A. Grosdidier as a member of this group (CMS data updated 2026-10-02).
- Oral and Maxillofacial Surgery Asso of Eau Claire SC3 clinicians in the group
Specialties
- Oral Surgeryprimary
Other oral surgeons in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | DDS |
|---|---|
| Medical school | University Of Minnesota School Of Dentistry |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447605886 |
| 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