Hawaii has approximately 280,000 Medicare beneficiaries , in a market shaped more than most by two dominant institutions: Kaiser Permanente Hawaii and the Hawaii Medical Service Association (HMSA), the long-established Blue Cross Blue Shield affiliate.1 The structural consequence is fewer plan choices than mainland markets but unusual integration between insurer and provider, especially within Kaiser Permanente.
What Medicare covers, and what it doesn’t
The biggest misconception in caregiving: Medicare is health insurance, not long-term care insurance. Medicare covers short rehab after a hospital stay. It does not cover ongoing custodial care once skilled rehabilitation ends.
What Medicare does cover:
- Part A (Hospital). Inpatient stays, skilled nursing rehab up to 100 days post-hospital, hospice, limited home health.
- Part B (Medical). Doctor visits, outpatient procedures, durable medical equipment, mental health, preventive care, ambulance (including medically-necessary inter-island air ambulance, with specific rules).
- Part D (Drugs). Prescription drug coverage, standalone or bundled into Medicare Advantage.
What Medicare does not cover:
- Assisted living, Adult Residential Care Homes, or other Hawaii residential care
- Memory care (anywhere, any state)
- Custodial nursing home beyond the 100-day rehab window
- Long-term in-home aide hours for personal-care support
- Dental, vision, hearing (Original Medicare; some MA plans add these)
Original Medicare vs. Medicare Advantage in Hawaii
Every Medicare-eligible person chooses between two structures: Original Medicare (Parts A and B, usually with Medigap and Part D) or Medicare Advantage (Part C, a private plan that bundles A, B, usually D, plus extras).
Hawaii’s Medicare Advantage penetration is roughly 45-50% in 2025 — close to but slightly below the national average.2The Hawaii MA market is dominated by Kaiser Permanente Hawaii (which offers an integrated care delivery model) and HMSA (Hawaii’s largest insurer). UnitedHealthcare and others compete on Oahu and to varying degrees on neighbor islands.
When Original Medicare + Medigap usually beats Advantage in Hawaii
- Your parent travels frequently to the mainland or between islands for specialty care. Original Medicare works nationally with any Medicare-accepting provider; Advantage plans have networks that may not cover all islands or mainland providers.
- Your parent has a complex condition and wants specialist access without referrals or prior authorizations.
- Your parent lives on a neighbor island where MA provider networks are thinner.
- Your parent can afford a Medigap monthly premium (Hawaii Medigap rates run approximately $180–$350/month for Plan G).
When Advantage may beat Original Medicare
- Your parent lives on Oahu year-round, is generally healthy, and is comfortable with an integrated network like Kaiser Permanente Hawaii.
- The total monthly cost of Original Medicare Part B + Medigap + Part D exceeds your parent’s budget.
- Your parent values the extras — dental, vision, hearing, gym, sometimes meal delivery — that Hawaii Advantage plans bundle in.
Medigap in Hawaii
Medigap plans are federally standardized — Plan G in Hawaii offers the same benefits as Plan G anywhere else — but state-specific pricing and enrollment rules apply.
- Hawaii rating method.Hawaii’s small market means fewer carriers compete than in larger states.
- Guaranteed issue applies during the 6-month Initial Enrollment Period when your parent turns 65 or first enrolls in Medicare Part B. Outside that window, insurers can use medical underwriting to deny or surcharge.
- Hawaii does not have an annual switching window. Unlike California, Washington, or Oregon, Hawaii doesn’t guarantee an annual Medigap switch without underwriting.
Medicare Savings Programs in Hawaii
If your parent has limited income, they may qualify for one of the federal Medicare Savings Programs (MSPs), administered in Hawaii by Med-QUEST:
- QMB (Qualified Medicare Beneficiary). Pays Part A and Part B premiums, deductibles, and coinsurance. Income limit approximately $1,442/month individual (2026) — Hawaii’s threshold is higher than the federal floor because Hawaii uses an adjusted federal poverty level.
- SLMB (Specified Low-Income Beneficiary). Pays Part B premium only. Higher income threshold.
- QI (Qualifying Individual). Pays Part B premium. Higher income threshold.
Hawaii’s adjusted federal poverty thresholds — higher than mainland thresholds to reflect Hawaii’s cost of living — mean more Hawaii seniors qualify for MSPs than the unadjusted federal limits would suggest. A Hawaii SHIP counselor can walk your parent through the application for free.
Annual Enrollment Period (AEP) in Hawaii
Medicare AEP runs from October 15 through December 7 each year. During this window your parent can:
- Switch from Original Medicare to Medicare Advantage (or vice versa)
- Switch from one Advantage plan to another
- Add, drop, or change a standalone Part D plan
Hawaii sees less aggressive AEP marketing than Florida or California, but the choice still matters — especially as Kaiser and HMSA both have multiple plans at different price points. Use Medicare.gov’s Plan Finder to compare plans by total annual cost.3
Inter-island provider considerations
For Hawaii families, the question of plan choice is bound up with the question of where care will happen. A few practical considerations:
- Specialty care concentration on Oahu. Many specialty services (advanced oncology, certain cardiac procedures, transplant) are only available on Oahu. Neighbor-island residents routinely fly to Honolulu for specialty appointments. Confirm the plan covers travel and that the desired Oahu specialists are in-network.
- Inter-island MA network gaps. Not all MA plans have equivalent networks across all islands. A plan with a strong Oahu network may have limited Kauai or Big Island providers.
- Medicare Plan Finder by ZIP code. Run Plan Finder using your parent’s ZIP code, not a general Hawaii search. Available plans differ across islands and within islands.
Where to get free help in Hawaii
Hawaii SHIP(also called Sage PLUS) is Hawaii’s federally-funded State Health Insurance Assistance Program. Counselors are housed in the Hawaii Executive Office on Aging and county Area Agencies on Aging. They don’t sell plans, take commissions, or represent insurers. Call 1-888-875-9229 or visit hawaiiship.org.4
For Hawaii Medicaid questions where Medicaid and Medicare interact, see our Hawaii Medicaid guide.