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

Willis John Rieker Jr., MD

Individual provider Cytopathology Physician · NPI 1689714834

Willis John Rieker Jr., MD is a Pathology in Beloit, Wisconsin. Graduated from Loyola University of Chicago, Stritch School of Medicine in 1984, 42 years ago. Practices with Hart Road Pathology, SC, a 3-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
42
Trained at
Loyola University of Chicago, Stritch School of Medicine
Licensed in
WI
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1969 W Hart Rd
Beloit, WI 53511-2230
Phone: (608) 364-5131
Fax: (608) 364-3185
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cytopathology Physician (primary) Taxonomy 207ZC0500X · Licence 35629-020 (WI)
Anatomic Pathology & Clinical Pathology Physician Taxonomy 207ZP0102X · Licence 35629-020 (WI)

Record details

NPI number1689714834
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 7, 2007
Last updated in NPPESSeptember 11, 2025

Medicare enrollment

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

Medicare specialtyPATHOLOGY
Medical schoolLOYOLA UNIVERSITY OF CHICAGO, STRITCH SCHOOL OF MEDICINE
Graduated 1984 (42 years in practice)
Group practice Hart Road Pathology, Sc — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount