Quick answers
- Does William F. Waltz accept Medicare assignment?
- Yes. Medicare's clinician data says William F. Waltz 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.
- What is William F. Waltz's NPI number?
- 1649226986. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William F. Waltz works
Medicare's Facility Affiliation Data lists William F. Waltz 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.
- Sanford Usd Medical CenterSioux Falls, SD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 430027
Practice locations
Addresses where William F. Waltz is enrolled with Medicare (CMS data updated October 2, 2026).
- 1600 W 22nd StSioux Falls, SD 57105 (605) 312‑1000
- 4405 E 26th StSioux Falls, SD 57103
- 525 N Foster StMitchell, SD 57301 (605) 995‑5635
- 901 4th St NWWatertown, SD 57201
Group practices
Medicare enrollment lists William F. Waltz as a member of these groups (CMS data updated October 2, 2026).
- Sanford Medical Center857 clinicians in the group
- Sanford Clinic268 clinicians in the group
Specialties
- Pediatric Medicineprimary
Other pediatricians in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Other clinicians in Sanford Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Minnesota Medical School |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649226986 |
| 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
- 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