Quick answers
- Which hospitals does Johnathan Au work at?
- Medicare's official clinician data lists Johnathan Au at 5 hospitals: Door County Medical Center, HSHS St Clare Memorial Hospital, St Marys Hospital Medical Ctr, St Nicholas Hospital and St Vincent Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Johnathan Au see patients?
- Medicare's clinician data lists 13 practice locations, including Green Bay, WI, Sheboygan, WI and Oostburg, WI. Call before your visit to confirm the address.
- What is Johnathan Au's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Johnathan Au accept Medicare assignment?
- Yes. Medicare's clinician data says Johnathan Au 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 the phone number for Johnathan Au?
- (614) 340-7740, as listed in official Medicare / NPI Registry data.
- What is Johnathan Au's NPI number?
- 1518463231. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Johnathan Au works
Medicare's Facility Affiliation Data lists Johnathan Au at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Door County Medical CenterSturgeon Bay, WI · Critical Access Hospital · CCN 521358
- HSHS St Clare Memorial HospitalOconto Falls, WI · Critical Access Hospital · CCN 521310
- St Marys Hospital Medical CtrGreen Bay, WI · Acute Care Hospital · CCN 520097
- St Nicholas HospitalSheboygan, WI · Acute Care Hospital · CCN 520044
- St Vincent HospitalGreen Bay, WI · Acute Care Hospital · CCN 520075
Practice locations
Addresses where Johnathan Au is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 13; the Medicare profile lists all.
- 101 Cherry St, Unit 405Green Bay, WI 54301 (614) 340‑7740
- 1411 N Taylor DrSheboygan, WI 53081 (920) 457‑4858
- 15 S 10th St, Suite AOostburg, WI 53070 (920) 552‑5046
- 1931 Marinette AveMarinette, WI 54143 (920) 430‑8113
- 2223 Lime Kiln RdGreen Bay, WI 54311
Group practices
Medicare enrollment lists Johnathan Au as a member of these groups (CMS data updated 2026-10-02).
- St Vincent Hospital-Hospital Sisters-Third Order of St Francis603 clinicians in the group
- St Nicholas Hospital-Sisters of the Third Order of St Francis178 clinicians in the group
- Radiology Associates of the Fox Valley SC81 clinicians in the group
- Orthopedic and Sports Medicine Specialists of Green Bay, SC50 clinicians in the group
- Green Bay Radiology SC24 clinicians in the group
- GBR Sheboygan LLC22 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Green Bay
Clinicians with the same Medicare primary specialty in Green Bay, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518463231 |
| 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