Chad Koyanagi, M.D.
Specialist · Honolulu, HI
Chad Koyanagi, M.D. is a specialist with a practice address in Honolulu, Hawaii, and NPI 1770536088, issued on May 18, 2006. Check the license (Hawaii MD10043, as entered in NPPES) with the Hawaii board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Chad Koyanagi
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- MD10043 HI
Self-reported in NPPES; status is on the state search - Practice location
- 677 Ala Moana Blvd, Suite 1025, Honolulu, HI 96813
- Phone
- (808) 535-5975
- Enumerated
- May 18, 2006
- Entity
- Type 1 · individual
Also registered at 677 Ala Moana Blvd, Suite 1025
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Barry Carlton, M.D.Specialist1790736544
- Martina Kamaka, M.D.Specialist1316990625
- Marjorie Mau, M.D.Specialist1710932272
- Eugene Wang, M.D.Specialist1437192663
- Mihae YuSpecialist1891738944
Verify Chad Koyanagi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Hawaii board licenses this profession
Search for license MD10043Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
76% fewer Medicare Part D claims than the average specialist in 2024
362 Medicare Part D claims for 33 beneficiaries, against an average of 1,524 among the 12,477 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of claims.
Most prescribed
- Invega Sustenna84 claims
- Olanzapine38 claims
- Quetiapine Fumarate31 claims
- Invega Trinza25 claims
- Bupropion Xl24 claims
- Abilify Maintena20 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.
The practice group's Medicare quality score for 2023: 72.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,235.14
27 payments, mostly food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 9,482 providers of this specialty with any payment received $4,756.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
2 hospital and facility affiliations
- Castle Medical CenterKailua, HI
- Ihs The Institute For Human Services IncHonolulu, HI
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
165 specialist records list a Honolulu practice address
They are 165 of the 12,408 NPPES records with a Honolulu practice address, and 374 specialist records in Hawaii.
All 165 in Honolulu → All 374 in Hawaii → Every provider in Honolulu →
Other specialist records in Hawaii
- Jennifer Aberhart, BSC PTKihei, HI1164737805
- Bettina Ackermann, MDWailuku, HI1205807625
- Jhoan Acosta, CNAHonolulu, HI1043683725
- Vida AdamsEwa Beach, HI1043080765
- Matthew Adaniya, M.D.Honolulu, HI1407999097
- Iqbal Ahmed, M.D.Honolulu, HI1164472650
- Walter Aipa, LMTHonolulu, HI1386992725
- Sandee AkionaPearl City, HI1528895885
- Elizabeth AlmsLahaina, HI1639484827
- Alicia Ameden, LMTKailua Kona, HI1821120817
Common questions
What is Chad Koyanagi, M.D.'s NPI number?
Chad Koyanagi, M.D.'s National Provider Identifier (NPI) is 1770536088, issued on May 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Chad Koyanagi, M.D. located?
The NPPES record lists a practice address at 677 Ala Moana Blvd, Suite 1025, Honolulu, HI, 96813. Phone: (808) 535-5975. Providers update this record themselves, so call before visiting.
How can I verify Chad Koyanagi, M.D.'s license?
NPPES lists Hawaii license number MD10043, as entered by the provider. Search the Hawaii board that licenses this profession; the NPPES record confirms identity only.
How much does Chad Koyanagi, M.D. prescribe under Medicare Part D?
In 2024, Chad Koyanagi, M.D. had 362 Medicare Part D claims for 33 beneficiaries; the average among specialist prescribers was 1,524. Part D covers Medicare prescriptions only.
What is Chad Koyanagi, M.D.'s Medicare quality score?
The 2023 MIPS final score is 72.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.