Quick answers
- Does Calvin S. Oishi accept Medicare assignment?
- Yes. Medicare's clinician data says Calvin S. Oishi 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 Calvin S. Oishi see?
- In 2024, CMS data shows 625 Original Medicare patients and 4,404 services for Calvin S. Oishi. This counts Original Medicare only and measures volume, not quality.
- What is Calvin S. Oishi's NPI number?
- 1194776880. 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 Calvin S. Oishi, 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 | 625 |
|---|---|
| Services billed to Medicare | 4,404 |
| Different services or procedures | 75 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)1,676 services
- X-ray of knee, 1-2 views (73560)914 services
- X-ray of hip, 2-3 views (73502)213 services
- X-ray of shoulder, minimum of 2 views (73030)192 services
- New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more (99202)169 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%
- Arthritis75%
- Diabetes39%
- Chronic kidney disease37%
- Osteoporosis21%
Hospitals where Calvin S. Oishi works
Medicare's Facility Affiliation Data lists Calvin S. Oishi 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.
- Kuakini Medical CenterHonolulu, HI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 120007
Practice locations
Addresses where Calvin S. Oishi is enrolled with Medicare (CMS data updated October 2, 2026).
- 405 N Kuakini St, Suite 608Honolulu, HI 96817 (808) 484‑2042
- 98 -1247 Kaahumanu St, Suite 203Aiea, HI 96701 (808) 484‑2042
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Honolulu
Clinicians with the same Medicare primary specialty in Honolulu, HI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 1987 (39 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194776880 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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