JOHN ERIK WINTERHOLLER MD
NPI 1912536640
Radiology - Diagnostic Radiology in Madison, WI
About John Erik Winterholler Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN ERIK WINTERHOLLER MD (NPI 1912536640) is an individual diagnostic radiology provider in Madison, Wisconsin, licensed in Utah (14287656-1205) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with Mercy Health System Corp, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
John Erik Winterholler Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show John Winterholler reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Madison, WI 53705
- Reassigned Medicare billing, Wisconsin enrollment
- 206 clinicians in this Medicare group
Madison, WI 53717
- Reassigned Medicare billing, Wisconsin enrollment
- 422 clinicians in this Medicare group
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
Fort Atkinson, WI 53538
- Reassigned Medicare billing, Wisconsin enrollment
- 298 clinicians in this Medicare group
Spring Green, WI 53588
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1659301273 (Wisconsin)
- 168 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1699728550 (Wisconsin)
- 1,155 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Health System Corp
Acute Care Hospitals · Janesville, WIFort Memorial Hospital
Acute Care Hospitals · Fort Atkinson, WIUnitypoint Health - Meriter
Acute Care Hospitals · Madison, WIUniversity Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53792 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MADISON, WI 53792
MADISON, WI 53792
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Winterholler's NPI number?
The NPI number for John Winterholler is 1912536640. It was assigned to this individual provider in the NPPES registry on April 4, 2020.
Where is John Winterholler located?
John Winterholler practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-0572.
What is John Winterholler's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is John Winterholler enrolled in Medicare?
Yes. John Winterholler is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for John Winterholler's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Winterholler reassigns Medicare benefits to 6 organizations: University Of Wisconsin System Non Payroll (Madison, WI), Group Health Cooperative Of South Central Wisconsin (Madison, WI), University Of Wisconsin Medical Foundation, Inc (Middleton, WI), Fort Healthcare, Inc. (Fort Atkinson, WI), Richland Hospital (Spring Green, WI) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Winterholler's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Winterholler affiliated with any hospitals?
According to CMS data, John Winterholler is affiliated with Mercy Health System Corp, Fort Memorial Hospital, Unitypoint Health - Meriter and University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for John Winterholler was last updated on June 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# John Erik Winterholler, MD · NPI 1912536640
Diagnostic Radiology physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since April 4, 2020.
## Identity
- **NPI:** 1912536640 (Entity type: Individual)
- **Enumerated:** April 4, 2020
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** 14287656-1205 (Utah)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 HIGHLAND AVE, Madison, WI 53792-0001
- **Phone:** (608) 263-0572
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): University Of Wisconsin System Non Payroll (NPI 1346266319, Madison, WI); Group Health Cooperative Of South Central Wisconsin (NPI 1245260165, Madison, WI); University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI); Fort Healthcare, Inc. (NPI 1811916281, Fort Atkinson, WI); Richland Hospital (NPI 1952094138, Spring Green, WI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** June 2, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1912536640) · Data from the CMS NPPES public registry.