Quick answers
- Which hospitals does William T. Witmer work at?
- Medicare's official clinician data lists William T. Witmer at 5 hospitals: Aurora BayCare Medical Ctr, Aurora Medical Center Bay Area, Aurora Medical Ctr Manitowoc County, Bellin Memorial Hospital and Door County Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William T. Witmer see patients?
- Medicare's clinician data lists 5 practice locations, including Neenah, WI, Kaukauna, WI and Green Bay, WI. Call before your visit to confirm the address.
- What is William T. Witmer's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does William T. Witmer accept Medicare assignment?
- Yes. Medicare's clinician data says William T. Witmer 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 T. Witmer?
- (920) 720-8200, as listed in official Medicare / NPI Registry data.
- What is William T. Witmer's NPI number?
- 1033130653. 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 T. Witmer works
Medicare's Facility Affiliation Data lists William T. Witmer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aurora BayCare Medical CtrGreen Bay, WI · Acute Care Hospital · CCN 520193
- Aurora Medical Center Bay AreaMarinette, WI · Acute Care Hospital · CCN 520113
- Aurora Medical Ctr Manitowoc CountyTwo Rivers, WI · Acute Care Hospital · CCN 520034
- Bellin Memorial HospitalGreen Bay, WI · Acute Care Hospital · CCN 520049
- Door County Medical CenterSturgeon Bay, WI · Critical Access Hospital · CCN 521358
Practice locations
Addresses where William T. Witmer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1136 Westowne DrNeenah, WI 54956 (920) 720‑8200
- 1500 Arbor WayKaukauna, WI 54130 (920) 766‑3200
- 2253 W Mason StGreen Bay, WI 54303 (920) 327‑7246
- 2845 Greenbrier RdGreen Bay, WI 54311 (920) 288‑8000
- 3003 University DrMarinette, WI 54143 (715) 732‑8200
Group practices
Medicare enrollment lists William T. Witmer as a member of this group (CMS data updated 2026-10-02).
- BayCare Aurora LLC194 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Wisconsin →
Other cardiologists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Vanderbilt University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033130653 |
| 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 2026-10-02, retrieved 2026-10-29
- 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