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

John J Warner, MD

Individual provider Diagnostic Radiology Physician · NPI 1831291871

John J Warner, MD practises Diagnostic Radiology in Marshfield, Wisconsin. Graduated from University of Wisconsin School of Medicine in 1983, 43 years ago. Practices with Mchs Hospitals Inc, a 1,194-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
43
Trained at
University of Wisconsin 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

1000 N Oak Ave
Marshfield, WI 54449-5777
Phone: (715) 389-3555
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 28299 (WI)

Record details

NPI number1831291871
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 1, 2006
Last updated in NPPESSeptember 10, 2024
Certification dateSeptember 10, 2024

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE
Graduated 1983 (43 years in practice)
Group practice McHs Hospitals Inc — 1194 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations9 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 patients167
Services billed 207 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Colleagues at Mchs Hospitals Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1194 clinicians in the practice; 12 are shown here.

Other providers in Marshfield