Quick answers
- Does John M. Semenza Ii accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Semenza Ii 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 John M. Semenza Ii see?
- In 2024, CMS data shows 157 Original Medicare patients and 191 services for John M. Semenza Ii. This counts Original Medicare only and measures volume, not quality.
- What is John M. Semenza Ii's NPI number?
- 1427219443. 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 John M. Semenza Ii, 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 | 157 |
|---|---|
| Services billed to Medicare | 191 |
| Different services or procedures | 46 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)22 services
- Anesthesia for other procedure on large bowel using an endoscope (00811)18 services
- Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)18 services
- Anesthesia for open or endoscopic total shoulder joint replacement (01638)11 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 disease34%
- Ischemic heart disease24%
Hospitals where John M. Semenza Ii works
Medicare's Facility Affiliation Data lists John M. Semenza Ii 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.
- Kapiolani Medical Center for Women & ChildrenHonolulu, HI · Children's Hospital · Emergency services: listed by Medicare · CCN 123300
- 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 John M. Semenza Ii is enrolled with Medicare (CMS data updated October 2, 2026).
- 1301 Punchbowl StHonolulu, HI 96813 (808) 531‑1116
- 1319 Punahou StHonolulu, HI 96826 (808) 983‑6000
- 888 S King StHonolulu, HI 96813 (808) 522‑4000
- 888 S King St, Suite 700Honolulu, HI 96813 (808) 522‑4000
- 91 -2127 Fort Weaver RdEwa Beach, HI 96706 (808) 531‑1116
Group practices
Medicare enrollment lists John M. Semenza Ii as a member of these groups (CMS data updated October 2, 2026).
- Straub Clinic and Hospital419 clinicians in the group
- Island Medical Consultants LLC18 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Honolulu
Clinicians with the same Medicare primary specialty in Honolulu, HI — not a recommendation.
Other clinicians in Straub Clinic and Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Hawaii John A. Burns School Of Medicine |
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427219443 |
| 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