Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Rachel Tara Joy Gronau, MD

Individual provider Family Medicine Physician · NPI 1326227323

Rachel Tara Joy Gronau, MD is registered under Family Practice in Delavan, Wisconsin. Graduated from Medical College of Wisconsin in 2005, 21 years ago. Practices with Mercy Health System Corporation, a 751-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
21
Trained at
Medical College of Wisconsin
Licensed in
WI
In the registry since
2007
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

1038 E Geneva St
Delavan, WI 53115-1921 Not confirmed with CMS for 16 years — call before visiting
Phone: (262) 740-0681
Fax: (262) 740-0776
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 50149 (WI)

Record details

NPI number1326227323
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 26, 2007
Last updated in NPPESJune 14, 2010

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2005 (21 years in practice)
Group practice Mercy Health System Corporation — 751 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients371
Services billed 1,192 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.

  • St Croix Hospice Baraboo Hospice · Baraboo, WI · listed as St Croix Hospice, LLC
  • Delavan Health Services Nursing home · Delavan, WI · listed as Nsh Delavan LLC
  • Mercy Health System Corp Hospital · Janesville, WI
  • Mercy Walworth Hospital & Medical Center Hospital · Lake Geneva, WI
  • Mercyhealth At Home Home health agency · Janesville, WI
  • Mercyhealth At Home Hospice · Janesville, WI

Colleagues at Mercy Health System Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 751 clinicians in the practice; 12 are shown here.

Other providers in Delavan