Dr. John A. Zernia, MD
- Medicare services, 2023
- 139
- Part D claims, 2024
- 38
- Hospital affiliations
- 1
- Industry payments
- $348,300
- Medical groups
- 7
- Practice address
- 18601 Lincoln St, Whitehall, WI 54773
- Practice phone
- Call (715) 538-4361
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Zernia's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John A. Zernia is an emergency medicine physician in Whitehall, Wisconsin
Dr. Zernia practices at Gundersen Tri-County Hospital and Clinics in Whitehall, Wisconsin, part of Emplify Health.
Dr. Zernia's NPI, 1124022728, was assigned on June 10, 2005. Dr. Zernia graduated from Medical College of Wisconsin in 1985. Dr. Zernia holds Wisconsin license 27859.
- NPI
- 1124022728NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496889420
- NPI enumeration date
- June 10, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (715) 538-4361
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John A. Zernia practices at Gundersen Tri-County Hospital and Clinics in Whitehall, Wisconsin
Dr. Zernia's primary practice is Gundersen Tri-County Hospital and Clinics, at 18601 Lincoln St, Whitehall, WI 54773 in Trempealeau County. The practice phone is (715) 538-4361.
- Gundersen Tri-County Hospital and Clinics18601 Lincoln St, Whitehall, WI 54773 · Trempealeau CountyPhone(715) 538-4361
Source: Dmand AI Affiliation Data
Dr. John A. Zernia is affiliated with 4 sites of care and 7 medical groups
Dr. Zernia's primary practice is Gundersen Tri-County Hospital and Clinics in Whitehall, Wisconsin, part of Emplify Health. The medical group on file is Gundersen Lutheran Medical Center. Dmand AI also links Dr. Zernia to 6 more medical groups and 3 group practices and clinics, each named with a free account. Dr. Zernia's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John A. Zernia's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zernia practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gundersen Tri-County Hospital and Clinics | Available with a free account |
| +3 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John A. Zernia is one of 1,211 emergency medicine physicians in Wisconsin
Emergency medicine is Dr. Zernia's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Zernia is licensed in Wisconsin.
Specialties and state licenses
- Emergency medicine, WisconsinPrimary
Emergency medicine physicians near Dr. Zernia
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John A. Zernia billed Medicare for 139 services in 2023
CMS data shows 139 Medicare services from Dr. Zernia across 4 procedure codes in 2023. Medicare paid $11,443 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Zernia's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 2752023: 13949%
Dr. Zernia compared with the Wisconsin median for emergency medicine physicians, 2023
- Dr. Zernia
- Wisconsin median
- Medicare services
- 139vs 24643% below
- Part D claims
- 14vs 5775% below
Medians across 1,249 emergency medicine physicians in Wisconsin with Dmand AI profiles that report each measure.
Dr. Zernia's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Zernia?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zernia and other emergency medicine physicians in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John A. Zernia's patients have a median age of 42
Across all payers, Dmand AI patient panel data puts Dr. Zernia's median patient age at 42, with 57% women.
Dr. Zernia's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 42
Patient panel by sex, all payers
- Women57%
- Men43%
Source: Dmand AI Patient Panel Data
Dr. John A. Zernia wrote 38 Medicare Part D claims in 2024
In 2024, Dr. Zernia wrote 38 Medicare Part D claims for 25 patients. 97% of them were for generic drugs. CMS names the drug for 14 of them, across 1 drug with 11 or more claims each, at $37 in total drug cost. In 2022, CMS named 30 claims across 2 drugs.
Dr. Zernia's Part D claims by kind of drug, 2024
- Generic37 claims97%
- Brand-name and other1 claims3%
Dr. Zernia's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Zernia's Part D claims, 2024
- Antibiotics34%13 of 38 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 302023: 1453%
Drugs named by CMS: 1 in 2023, 2 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John A. Zernia takes part in Medicare
Dr. Zernia accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John A. Zernia received $348,300 in industry payments from 2016 to 2025
CMS Open Payments shows 113 general payments to Dr. Zernia from 3 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 100% of the total. Takeda Pharmaceuticals U.S.A., Inc. paid the most, $209,820.
General payments to Dr. Zernia by program year, 2016 to 2025
Companies that paid Dr. Zernia the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John A. Zernia graduated from Medical College of Wisconsin
Dr. Zernia graduated from Medical College of Wisconsin in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John A. Zernia's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John A. Zernia
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John A. Zernia's NPI number?
Dr. John A. Zernia's NPI number is 1124022728. It was assigned on June 10, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John A. Zernia?
Dr. John A. Zernia is an emergency medicine physician in Whitehall, Wisconsin. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. John A. Zernia practice?
Dr. Zernia practices at 18601 Lincoln St, Whitehall, WI 54773. Dr. Zernia's primary practice is Gundersen Tri-County Hospital and Clinics in Whitehall, Wisconsin, part of Emplify Health. Dmand AI also links Dr. Zernia to 6 medical groups and 3 group practices and clinics.
What is Dr. John A. Zernia's office phone number?
The practice phone on file for Dr. Zernia is (715) 538-4361.
What is Dr. John A. Zernia's medical license number?
Dr. Zernia holds Wisconsin license 27859.
Which hospitals is Dr. John A. Zernia affiliated with?
Dr. Zernia practices at Gundersen Tri-County Hospital and Clinics in Whitehall, Wisconsin.
What medical group is Dr. John A. Zernia part of?
Dr. Zernia is linked to Gundersen Lutheran Medical Center. Dmand AI links Dr. Zernia to 6 more medical groups.
Does Dr. John A. Zernia accept Medicare?
Yes. CMS data shows Dr. Zernia billed Medicare for 139 services in 2023, and Dr. Zernia accepts Medicare assignment.
What services does Dr. John A. Zernia bill to Medicare?
In 2023, Dr. Zernia's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and office visit, established patient (99213).
Where did Dr. John A. Zernia go to medical school?
Dr. Zernia graduated from Medical College of Wisconsin in 1985.
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What drugs does Dr. John A. Zernia prescribe most?
In 2023 Medicare Part D data, Dr. Zernia's most prescribed drugs by claims were Prednisone.
Has Dr. John A. Zernia received payments from drug or device companies?
CMS Open Payments shows $348,300 in general payments to Dr. Zernia from 3 companies from 2016 to 2025. The largest total came from Takeda Pharmaceuticals U.S.A., Inc.
How long has Dr. John A. Zernia been practicing?
Dr. Zernia graduated from medical school in 1985, 41 years ago.
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