KEN KOYANAGAWA DO
NPI 1225603053
Emergency Medicine in Bremerton, WA
About Ken Koyanagawa Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KEN KOYANAGAWA DO (NPI 1225603053) is an individual emergency medicine provider in Bremerton, Washington, licensed in Washington (OP61674900) and active in the NPI registry since May 2021. He is enrolled in Medicare PECOS, is affiliated with Harrison Medical Center, and maintains a secondary practice location in Port Orchard.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ken Koyanagawa Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Ken Koyanagawa reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bremerton, WA 98312
- Reassigned Medicare billing, Washington enrollment
- 1,526 clinicians in this Medicare group
Federal Way, WA 98003
- Reassigned Medicare billing, Washington enrollment
- 190 clinicians in this Medicare group
Arlington, WA 98223
- Reassigned Medicare billing, Washington enrollment
- 519 clinicians in this Medicare group
Brooklyn, NY 11206
- Reassigned Medicare billing, New York enrollment
- 49 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Harrison Medical Center
Acute Care Hospitals · Bremerton, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98312 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 19
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ken Koyanagawa's NPI number?
The NPI number for Ken Koyanagawa is 1225603053. It was assigned to this individual provider in the NPPES registry on May 24, 2021.
Where is Ken Koyanagawa located?
Ken Koyanagawa practices at 4205 Kitsap Way, Bremerton, WA 98312. The listed phone number is (360) 782-7780.
What is Ken Koyanagawa's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ken Koyanagawa enrolled in Medicare?
Yes. Ken Koyanagawa is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Ken Koyanagawa's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ken Koyanagawa reassigns Medicare benefits to 4 organizations: Franciscan Medical Group (Bremerton, WA), Northwest Observation Associates PC (Federal Way, WA), Northwest Emergency Physicians LLC (Arlington, WA) and Modern Physician Services PC (Brooklyn, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ken Koyanagawa's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ken Koyanagawa accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list Ken Koyanagawa as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Ken Koyanagawa affiliated with any hospitals?
According to CMS data, Ken Koyanagawa is affiliated with Harrison Medical Center.
When was this NPI record last updated?
The NPPES record for Ken Koyanagawa was last updated on December 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Ken Koyanagawa, DO · NPI 1225603053
Emergency Medicine physician in Bremerton, Washington. Individual provider, active in the CMS NPPES registry since May 24, 2021.
## Identity
- **NPI:** 1225603053 (Entity type: Individual)
- **Enumerated:** May 24, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** OP61674900 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 4205 KITSAP WAY, Bremerton, WA 98312-2447
- **Phone:** (360) 782-7780 · **Fax:** (360) 782-7789
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Franciscan Medical Group (NPI 1316756067, Bremerton, WA); Northwest Observation Associates PC (NPI 1023539376, Federal Way, WA); Northwest Emergency Physicians LLC (NPI 1235172370, Arlington, WA); Modern Physician Services PC (NPI 1932590601, Brooklyn, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** December 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1225603053) · Data from the CMS NPPES public registry.