Naoky C. Tsai, MD

Medicare activity in 2024

Official CMS public-use data for Naoky C. Tsai, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)179 services
2. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)80 services
3. Biopsy of large bowel using a flexible endoscope (45380)40 services
4. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)21 services
5. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)19 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%
• Arthritis43%
• Diabetes41%
• Chronic kidney disease28%
• Osteoporosis28%

Hospitals where Naoky C. Tsai works

Medicare's Facility Affiliation Data lists Naoky C. Tsai 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.

• Adventist Health CastleKailua, HI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 120006
• Pali Momi Medical CenterAiea, HI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 120026
• Straub Clinic and HospitalHonolulu, HI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 120022
• The Queens Medical CenterHonolulu, HI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 120001

Practice locations

Addresses where Naoky C. Tsai is enrolled with Medicare (CMS data updated October 2, 2026).

• 640 Ulukahiki StKailua, HI 96734 (808) 263‑5142
• 642 Ulukahiki St, Suite 103Kailua, HI 96734 (808) 263‑5241

Group practices

Medicare enrollment lists Naoky C. Tsai as a member of this group (CMS data updated October 2, 2026).

• Castle Medical Center77 clinicians in the group

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in Hawaii →

Other gastroenterologists in Hawaii

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

• Kha H. Ngo, DO
• Melissa H. Corson, MD
• Felix H. Lui, MD
• Larissa L. Fujii-Lau, MD
• James L. Grobe, MD
• Pedro A. Manibusan Jr.
• Eugene H. Kamemoto, MD
• Aaron L. Woofter, MD

All gastroenterologists in Hawaii →

Other clinicians in Castle Medical Center

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• William S. Loui, MD
• Owen D. Kaneshiro, MD
• James P. Jones, DO
• Kerian Dodds, MD
• Robin Matsukawa, MD
• Christopher R. Dubuque, DO

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