JOHN A ZERNIA MD
NPI 1124022728
Emergency Medicine in La Crosse, WI
About John A Zernia Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN A ZERNIA MD (NPI 1124022728) is an individual emergency medicine provider in La Crosse, Wisconsin, licensed in Wisconsin (27859) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Gundersen Tri-county Hospital & Clinics, and is a graduate of Medical College Of Wisconsin (1985).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
Accepted Insurance
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 A Zernia 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
7Medicare enrollment records show John Zernia reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin enrollment
- 928 clinicians in this Medicare group
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin enrollment
- 1,457 clinicians in this Medicare group
Blair, WI 54616
- Reassigned Medicare billing, Wisconsin enrollment
- 293 clinicians in this Medicare group
Tomah, WI 54660
- Reassigned Medicare billing, Wisconsin enrollment
- 249 clinicians in this Medicare group
Hillsboro, WI 54634
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: St Josephs Health Services Inc
- 282 clinicians in this Medicare group
Boscobel, WI 53805
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1306804794 (Wisconsin)
- 76 clinicians in this Medicare group
Friendship, WI 53934
- Reassigned Medicare billing, Wisconsin enrollment
- 67 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Gundersen Tri-County Hospital & Clinics
Critical Access Hospitals · Whitehall, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54601 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.
LA CROSSE, WI 54601
LA CROSSE, WI 54601
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 Zernia's NPI number?
The NPI number for John Zernia is 1124022728. It was assigned to this individual provider in the NPPES registry on June 10, 2005.
Where is John Zernia located?
John Zernia practices at 1836 South Ave, La Crosse, WI 54601. The listed phone number is (608) 782-7300.
What is John Zernia's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Zernia enrolled in Medicare?
Yes. John Zernia 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 Zernia's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Zernia reassigns Medicare benefits to 7 organizations: Gundersen Clinic Ltd (La Crosse, WI), Gundersen Lutheran Medical Center, Inc (La Crosse, WI), Tri-County Memorial Hospital, Inc. (Blair, WI), Tomah Memorial Hospital Inc (Tomah, WI), St. Joseph's Health Services, Inc. (Hillsboro, WI) and 2 more organizations, 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 Zernia's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Zernia accept?
Health plans from Group Health Cooperative-SCW list John Zernia as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Zernia affiliated with any hospitals?
According to CMS data, John Zernia is affiliated with Gundersen Tri-County Hospital & Clinics.
When was this NPI record last updated?
The NPPES record for John Zernia was last updated on June 21, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years 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 A Zernia, MD · NPI 1124022728
Emergency Medicine physician in La Crosse, Wisconsin. Individual provider, active in the CMS NPPES registry since June 10, 2005.
## Identity
- **NPI:** 1124022728 (Entity type: Individual)
- **Enumerated:** June 10, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 27859 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1836 SOUTH AVE, La Crosse, WI 54601-5429
- **Phone:** (608) 782-7300
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Gundersen Clinic Ltd (NPI 1851343115, La Crosse, WI); Gundersen Lutheran Medical Center, Inc (NPI 1619210895, La Crosse, WI); Tri-County Memorial Hospital, Inc. (NPI 1659625192, Blair, WI); Tomah Memorial Hospital Inc (NPI 1992970453, Tomah, WI); St. Joseph's Health Services, Inc. (NPI 1972591410, Hillsboro, WI); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Wisconsin, class of 1985
## Record status
- **NPPES last updated:** June 21, 2017
- **Other identifiers:** Medicare UPIN B57831; Medicaid 31407300 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1124022728) · Data from the CMS NPPES public registry.