Quick answers
- Which hospitals does John J. Koo work at?
- Medicare's official clinician data lists John J. Koo at 3 hospitals: Adventist Health Castle, Kona Community Hospital and Straub Clinic and Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. Koo see patients?
- Medicare's clinician data lists 1 practice location in Kailua, HI. Call before your visit to confirm the address.
- What is John J. Koo's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John J. Koo accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Koo accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John J. Koo?
- (808) 263-6500, as listed in official Medicare / NPI Registry data.
- What is John J. Koo's NPI number?
- 1477617561. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John J. Koo works
Medicare's Facility Affiliation Data lists John J. Koo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health CastleKailua, HI · Acute Care Hospital · CCN 120006
- Kona Community HospitalKealakekua, HI · Acute Care Hospital · CCN 120019
- Straub Clinic and HospitalHonolulu, HI · Acute Care Hospital · CCN 120022
Practice locations
Addresses where John J. Koo is enrolled with Medicare (CMS data updated 2026-10-02).
- 640 Ulukahiki StKailua, HI 96734 (808) 263‑6500
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Kailua
Clinicians with the same Medicare primary specialty in Kailua, HI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477617561 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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