Roy M. Matsuyama, MD

Medicare activity in 2024

Official CMS public-use data for Roy M. Matsuyama, 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.

Most frequent services

1. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)91 services
2. Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)78 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)51 services
4. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)48 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)46 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 cholesterol75%
• High blood pressure66%
• Arthritis33%
• Diabetes24%
• Ischemic heart disease22%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)19%

Hospitals where Roy M. Matsuyama works

Medicare's Facility Affiliation Data lists Roy M. Matsuyama at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Maui Memorial Medical CenterWailuku, HI · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 120002

Practice locations

Addresses where Roy M. Matsuyama is enrolled with Medicare (CMS data updated October 2, 2026).

• 173 Hoohana St, Suite 104Kahului, HI 96732 (808) 871‑7222

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in Hawaii →

Other gastroenterologists in Hawaii

Clinicians with the same Medicare primary specialty in Hawaii — not a recommendation.

• Gavin Park, MD
• Jonathan C. Gochu, MD
• Stephen D. Coleman, MD
• Shilpa Jain, MD
• Aaron J. Small, MD
• Ronald D. Ahloy, MD
• Scott K. Kuwada, MD
• Jaclyn E. Kagihara, MD

All gastroenterologists in Hawaii →

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians