Quick answers
- Which hospitals does Chi Wan Koo work at?
- Medicare's official clinician data lists Chi Wan Koo at 2 hospitals: Mayo Clinic Hospital Rochester and MercyOne North Iowa Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Chi Wan Koo see patients?
- Medicare's clinician data lists 1 practice location in Rochester, MN. Call before your visit to confirm the address.
- What is Chi Wan Koo's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Chi Wan Koo accept Medicare assignment?
- Yes. Medicare's clinician data says Chi Wan Koo 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 Chi Wan Koo?
- (507) 284-2511, as listed in official Medicare / NPI Registry data.
- What is Chi Wan Koo's NPI number?
- 1285898361. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Chi Wan Koo works
Medicare's Facility Affiliation Data lists Chi Wan Koo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mayo Clinic Hospital RochesterRochester, MN · Acute Care Hospital · CCN 240010
- MercyOne North Iowa Medical CenterMason City, IA · Acute Care Hospital · CCN 160064
Practice locations
Addresses where Chi Wan Koo is enrolled with Medicare (CMS data updated 2026-10-02).
- 200 1st St SWRochester, MN 55905 (507) 284‑2511
Group practices
Medicare enrollment lists Chi Wan Koo as a member of this group (CMS data updated 2026-10-02).
- Mayo Clinic4,956 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Rochester
Clinicians with the same Medicare primary specialty in Rochester, MN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285898361 |
| 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