Quick answers
- Does Shayne M. Castanera accept Medicare assignment?
- Yes. Medicare's clinician data says Shayne M. Castanera 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 Shayne M. Castanera see?
- In 2024, CMS data shows 113 Original Medicare patients and 433 services for Shayne M. Castanera. This counts Original Medicare only and measures volume, not quality.
- What is Shayne M. Castanera's NPI number?
- 1053337469. 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 Shayne M. Castanera, 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 | 113 |
|---|---|
| Services billed to Medicare | 433 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 81 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)204 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)110 services
- Hospital discharge day management, more than 30 minutes (99239)75 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)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%
- Chronic kidney disease59%
- Arthritis50%
- Diabetes46%
- Ischemic heart disease46%
Hospitals where Shayne M. Castanera works
Medicare's Facility Affiliation Data lists Shayne M. Castanera 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.
- Pali Momi Medical CenterAiea, HI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 120026
Practice locations
Addresses where Shayne M. Castanera is enrolled with Medicare (CMS data updated October 2, 2026).
- 98 -1079 Moanalua RdAiea, HI 96701 (808) 254‑4670
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Aiea
Clinicians with the same Medicare primary specialty in Aiea, HI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Hawaii John A. Burns School Of Medicine |
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1053337469 |
| 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