Quick answers
- Does Ken Koyanagawa accept Medicare assignment?
- Yes. Medicare's clinician data says Ken Koyanagawa accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Ken Koyanagawa's NPI number?
- 1225603053. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ken Koyanagawa works
Medicare's Facility Affiliation Data lists Ken Koyanagawa at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- St Michael Medical CenterSilverdale, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 500039
Practice locations
Addresses where Ken Koyanagawa is enrolled with Medicare (CMS data updated October 2, 2026).
- 4205 Kitsap WayBremerton, WA 98312 (360) 782‑7780
Group practices
Medicare enrollment lists Ken Koyanagawa as a member of this group (CMS data updated October 2, 2026).
- Franciscan Medical Group1,421 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Bremerton
Clinicians with the same Medicare primary specialty in Bremerton, WA — not a recommendation.
Other clinicians in Franciscan Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2021 (5 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225603053 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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