Quick answers
- Does Roy Y. Matsumoto accept Medicare assignment?
- Yes. Medicare's clinician data says Roy Y. Matsumoto 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 Roy Y. Matsumoto see?
- In 2024, CMS data shows 312 Original Medicare patients and 663 services for Roy Y. Matsumoto. This counts Original Medicare only and measures volume, not quality.
- What is Roy Y. Matsumoto's NPI number?
- 1437250826. 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 Roy Y. Matsumoto, 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 | 312 |
|---|---|
| Services billed to Medicare | 663 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient complete exam of visual system (92014)300 services
- Photography of the retina (92250)223 services
- Imaging of optic nerve (92133)58 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)52 services
- Exam of visual field with extended testing (92083)12 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%
- Diabetes36%
- Chronic kidney disease35%
- Arthritis19%
- Osteoporosis19%
Practice locations
Addresses where Roy Y. Matsumoto is enrolled with Medicare (CMS data updated October 2, 2026).
- 94 -1030 Waipio Uka St, Suite 102Waipahu, HI 96797 (808) 671‑6731
Group practices
Medicare enrollment lists Roy Y. Matsumoto as a member of this group (CMS data updated October 2, 2026).
- Roy y Matsumoto O D Inc2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Waipahu
Clinicians with the same Medicare primary specialty in Waipahu, HI — not a recommendation.
Other clinicians in Roy y Matsumoto O D Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Pacific University - College Of Optometry |
| Graduation year | 1985 (41 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437250826 |
| 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