Quick answers
- Which hospitals does Kei Ko work at?
- Medicare's official clinician data lists Kei Ko at 5 hospitals: Aspirus Eagle River Hospital, Aspirus Merrill Hospital, Aspirus Rhinelander Hospital, Aspirus Tomahawk Hospital and Howard Young Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Kei Ko see patients?
- Medicare's clinician data lists 4 practice locations, including Eagle River, WI, Rhinelander, WI and Woodruff, WI. Call before your visit to confirm the address.
- What is Kei Ko's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Kei Ko accept Medicare assignment?
- Yes. Medicare's clinician data says Kei Ko 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 Kei Ko?
- (715) 479-7411, as listed in official Medicare / NPI Registry data.
- What is Kei Ko's NPI number?
- 1649582768. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Kei Ko works
Medicare's Facility Affiliation Data lists Kei Ko at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aspirus Eagle River HospitalEagle River, WI · Critical Access Hospital · CCN 521300
- Aspirus Merrill HospitalMerrill, WI · Critical Access Hospital · CCN 521339
- Aspirus Rhinelander HospitalRhinelander, WI · Acute Care Hospital · CCN 520019
- Aspirus Tomahawk HospitalTomahawk, WI · Critical Access Hospital · CCN 521313
- Howard Young Medical CenterWoodruff, WI · Acute Care Hospital · CCN 520091
Practice locations
Addresses where Kei Ko is enrolled with Medicare (CMS data updated 2026-10-02).
- 201 Hospital RdEagle River, WI 54521 (715) 479‑7411
- 2251 N Shore Dr, Suite 200Rhinelander, WI 54501 (715) 361‑2000
- 240 Maple StWoodruff, WI 54568 (715) 356‑8000
- 601 S Ctr AveMerrill, WI 54452 (715) 536‑5511
Group practices
Medicare enrollment lists Kei Ko as a member of these groups (CMS data updated 2026-10-02).
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.574 clinicians in the group
- Howard Young Medical Center Inc of Woodruff Wisconsin56 clinicians in the group
- Aspirus Eagle River Hospital and Clinics, Inc34 clinicians in the group
- Aspirus Merrill Hospital and Clinics Inc18 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Eagle River
Clinicians with the same Medicare primary specialty in Eagle River, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649582768 |
| 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