Gaku Yamaguchi, M.D.
Family Medicine Physician · Hilo, HI
Gaku Yamaguchi, M.D. is a family medicine physician with a practice address in Hilo, Hawaii, and NPI 1033592126, issued on Jul 7, 2015. Check the license (Hawaii MD-19597, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gaku Yamaguchi
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD-19597 HI
Self-reported in NPPES; status is on the state search - Practice location
- 1438 Kilauea Ave, Hilo, HI 96720
- Phone
- (808) 969-9220
- Enumerated
- Jul 7, 2015
- Record last updated
- Dec 19, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190125001751); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 730 in Hawaii → Look up another NPI →
Verify Gaku Yamaguchi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD-19597Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average family medicine physician in 2024
2,234 Medicare Part D claims for 173 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Atorvastatin Calcium201 claims
- Losartan Potassium183 claims
- Amlodipine Besylate96 claims
- Albuterol Sulfate Hfa76 claims
- Metoprolol Succinate74 claims
- Trulicity72 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 one group practice
- Hui Malama Ola NA OiwiHilo, HI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gaku Yamaguchi among 730 family medicine physician records in Hawaii
Gaku Yamaguchi, M.D. is one of 730 family medicine physician records with a practice address in Hawaii. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 72% of them.
- NPI issued2015 · 72% of these records are older, 24% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2015 · median 2006 among the 383 with a school on file
- Record last updated2018 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
58 family medicine physician records list a practice address in Hilo
They are 58 of the 1,758 NPPES records with a practice address in Hilo, and 730 family medicine physician records in Hawaii.
All 730 in Hawaii → Every provider in Hilo → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Alice Adee, MDHilo, HI 967201376638734
- Wilfred Alik, MDHilo, HI 967201366542060
- Susan Cauley, M.D.Hilo, HI 967201881701076
- Lynda Dolan, M.D.Hilo, HI 967201548207319
- Charles Dundas, M.D.Hilo, HI 967201285647826
- Edwin Etcubanez, MDHilo, HI 967201679555866
- Sheareen Gedayloo, M.D.Hilo, HI 967201801840525
- Lily Gillespie, MDHilo, HI 967201649370412
Common questions
What is Gaku Yamaguchi, M.D.'s NPI number?
Gaku Yamaguchi, M.D.'s National Provider Identifier (NPI) is 1033592126, issued on Jul 7, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Gaku Yamaguchi, M.D. located?
The NPPES record lists a practice address at 1438 Kilauea Ave, Hilo, HI, 96720. Phone: (808) 969-9220. Providers update this record themselves, so call before visiting.
How can I verify Gaku Yamaguchi, M.D.'s license?
NPPES lists Hawaii license number MD-19597, as entered by the provider. Search the Hawaii Medical Board at https://cca.hawaii.gov/pvl/boards/medical/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gaku Yamaguchi, M.D. prescribe under Medicare Part D?
In 2024, Gaku Yamaguchi, M.D. had 2,234 Medicare Part D claims for 173 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.