Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

William T Witmer, MD

Individual provider Interventional Cardiology Physician · NPI 1033130653

William T Witmer, MD is registered under Cardiovascular Disease (Cardiology) in Green Bay, Wisconsin. Graduated from Vanderbilt University School of Medicine in 1988, 38 years ago. Practices with Baycare Aurora LLC, a 199-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
38
Trained at
Vanderbilt University School of Medicine
Licensed in
WI
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2845 Greenbrier Rd Ste 310
Green Bay, WI 54311-6519 Not confirmed with CMS for 18 years — call before visiting
Phone: (920) 288-8300
Fax: (920) 288-8305
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Interventional Cardiology Physician (primary) Taxonomy 207RI0011X · Licence 30867 (WI)

Record details

NPI number1033130653
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 21, 2006
Last updated in NPPESSeptember 30, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolVANDERBILT UNIVERSITY SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Baycare Aurora Llc — 199 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients1,058
Services billed 1,636 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Aurora Medical Center Bay Area Hospital · Marinette, WI · listed as Aurora Medical Center Bay Area, Inc
  • Bellin Memorial Hospital Hospital · Green Bay, WI
  • Aurora Baycare Medical Ctr Hospital · Green Bay, WI
  • Aurora Medical Ctr Manitowoc County Hospital · Two Rivers, WI
  • Door County Medical Center Hospital · Sturgeon Bay, WI

Colleagues at Baycare Aurora LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 199 clinicians in the practice; 12 are shown here.

Other providers in Green Bay