Quick answers
- Which hospitals does John A. Johnkoski work at?
- Medicare's official clinician data lists John A. Johnkoski at 5 hospitals: Aspirus Medford Hospital & Clinics, Inc, Aspirus Rhinelander Hospital, Aspirus Stanley Hospital, Aspirus Stevens Point Hospital & Clinics, Inc. and Aspirus Wausau Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Johnkoski see patients?
- Medicare's clinician data lists 2 practice locations, including Weston, WI and Wausau, WI. Call before your visit to confirm the address.
- What is John A. Johnkoski's specialty?
- Medicare lists Thoracic Surgery as the primary specialty.
- Does John A. Johnkoski accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Johnkoski accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is John A. Johnkoski's NPI number?
- 1992737035. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John A. Johnkoski works
Medicare's Facility Affiliation Data lists John A. Johnkoski at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aspirus Medford Hospital & Clinics, IncMedford, WI · Critical Access Hospital · CCN 521324
- Aspirus Rhinelander HospitalRhinelander, WI · Acute Care Hospital · CCN 520019
- Aspirus Stanley HospitalStanley, WI · Critical Access Hospital · CCN 521311
- Aspirus Stevens Point Hospital & Clinics, Inc.Stevens Point, WI · Acute Care Hospital · CCN 520002
- Aspirus Wausau HospitalWausau, WI · Acute Care Hospital · CCN 520030
Practice locations
Addresses where John A. Johnkoski is enrolled with Medicare (CMS data updated 2026-10-02).
- 4005 Community Ctr DrWeston, WI 54476
- 425 Pine Ridge BlvdWausau, WI 54401
Group practices
Medicare enrollment lists John A. Johnkoski as a member of this group (CMS data updated 2026-10-02).
- Aspirus Medical Group, Inc.268 clinicians in the group
Specialties
- Thoracic Surgeryprimary
Other thoracic surgeons in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992737035 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians