Quick answers
- Does Gaku Yamaguchi accept Medicare assignment?
- Yes. Medicare's clinician data says Gaku Yamaguchi 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.
- How many Medicare patients does Gaku Yamaguchi see?
- In 2024, CMS data shows 112 Original Medicare patients and 783 services for Gaku Yamaguchi. This counts Original Medicare only and measures volume, not quality.
- What is Gaku Yamaguchi's NPI number?
- 1033592126. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gaku Yamaguchi, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 112 |
|---|---|
| Services billed to Medicare | 783 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)325 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)292 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)119 services
- Transitional care management services for problem of at least moderate complexity (99495)13 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes30%
- Arthritis26%
- Osteoporosis25%
- Chronic kidney disease19%
Practice locations
Addresses where Gaku Yamaguchi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1438 Kilauea AveHilo, HI 96720 (808) 969‑9220
- 82 Puuhonu Pl, Suite 209Hilo, HI 96720 (808) 796‑3125
Group practices
Medicare enrollment lists Gaku Yamaguchi as a member of this group (CMS data updated October 2, 2026).
- Hui Malama Ola Na Oiwi4 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Hilo
Clinicians with the same Medicare primary specialty in Hilo, HI — not a recommendation.
Other clinicians in Hui Malama Ola Na Oiwi
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033592126 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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