Ken Koyanagawa, DO
Emergency Medicine Physician · Bremerton, WA
Ken Koyanagawa, DO is an emergency medicine physician with a practice address in Bremerton, Washington, and NPI 1225603053, issued on May 24, 2021. Check the license (Washington OP61674900, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Ken Koyanagawa
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- OP61674900 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4205 Kitsap Way, Bremerton, WA 98312
- Phone
- (360) 782-7780
- Enumerated
- May 24, 2021
- Record last updated
- Dec 30, 2025
- Fax
- (360) 782-7789
- Medicare enrollment
- Enrolled (PECOS I20250717001053); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,459 in Washington → Look up another NPI →
Also registered at 4205 Kitsap Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nidal Almasri, DMSC, PA-CMedical Physician Assistant1851006829
- Tyler Brown, PACPhysician Assistant1720873144
- Scott Ekin, MDEmergency Medicine Physician1700817871
- Henry Hauser, MDEmergency Medicine Physician1952988073
- Ashley Johnson, FNPFamily Nurse Practitioner1245175280
- Ryan Menges, PA-CMedical Physician Assistant1437702057
Verify Ken Koyanagawa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license OP61674900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average emergency medicine physician in 2024
99 Medicare Part D claims for 72 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Ibuprofen22 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Franciscan Medical GroupBremerton, WA
- Modern Physician Services PCBrooklyn, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ken Koyanagawa among 1,459 emergency medicine physician records in Washington
Ken Koyanagawa, DO is one of 1,459 emergency medicine physician records with a practice address in Washington. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 94% of them.
- NPI issued2021 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2021 · median 2010 among the 851 with a school on file
- Record last updated2025 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in Washington
There are 1,459 emergency medicine physician records in Washington.
All 1,459 in Washington → Every provider in Bremerton → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Randy Baldwin, MDBremerton, WA 983121093789471
- William Cogar, DOBremerton, WA 983121013083245
- John Deordio, M.D.Bremerton, WA 983121942276142
- Paul Dutky, MDBremerton, WA 983121134188253
- Scott Ekin, MDBremerton, WA 983121700817871
- Elizabeth Gray, M.D.Bremerton, WA 983121316918410
- Henry Hauser, MDBremerton, WA 983121952988073
- Phillip Hunt, MDBremerton, WA 983121437155587
Common questions
What is Ken Koyanagawa, DO's NPI number?
Ken Koyanagawa, DO's National Provider Identifier (NPI) is 1225603053, issued on May 24, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Ken Koyanagawa, DO located?
The NPPES record lists a practice address at 4205 Kitsap Way, Bremerton, WA, 98312. Phone: (360) 782-7780. Providers update this record themselves, so call before visiting.
How can I verify Ken Koyanagawa, DO's license?
NPPES lists Washington license number OP61674900, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ken Koyanagawa, DO prescribe under Medicare Part D?
In 2024, Ken Koyanagawa, DO had 99 Medicare Part D claims for 72 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.