Turning 65 in Hawaii: your Medicare starter guide

Turning 65 comes with a stack of Medicare mail and a few decisions that matter for the rest of your life. Here is the plain-English version — what to do, when, and which deadlines you really don’t want to miss — with the Hawaii twists that most guides leave out. When you are ready, we walk through your specific options at no cost.

1. Your enrollment window: the 7-month Initial Enrollment Period

Your Initial Enrollment Period (IEP) is seven months long: the three months before the month you turn 65, your birthday month, and the three months after. Signing up in the three months before your birthday means coverage starts the first of your birthday month. You enroll through Social Security (online at ssa.gov, by phone, or at the Honolulu, Hilo, Kahului or Lihue office); if you already draw Social Security you are enrolled in A and B automatically.

• Part A (hospital) is premium-free for most people, so most enroll when first eligible.
• Part B (medical) carries the $202.90 standard monthly premium in 2026 — and a timing decision if you are still working (see below).

2. The parts of Medicare, briefly

• Part A — inpatient hospital, skilled nursing, hospice.
• Part B — doctors, outpatient care, preventive services.
• Part C (Medicare Advantage) — a private all-in-one alternative that bundles A, B and usually drug coverage, sold by county. In Hawaii that mostly means Kaiser Senior Advantage or HMSA Akamai Advantage.
• Part D — prescription drug coverage.
• Medigap — a supplement that pairs with A and B and works with any Medicare provider on any island or the mainland. It does not work at Kaiser.

3. Your big decision: two paths

Where you get care tilts the answer. If your doctors are Kaiser doctors and you want to keep them, the path is Kaiser Senior Advantage, and its service area is Honolulu County, most of Hawaii County and the island of Maui. If your doctors are at Queen’s, Hawaii Pacific Health, the public hospitals or in independent practice, you have a real choice between HMSA or a national Advantage plan and Original Medicare with a supplement. On Kauai, Molokai and Lanai, and for anyone who flies to Oahu or the mainland for specialty care, a Medigap policy’s any-provider access is often the practical answer; our Neighbor Islands guide goes through it. Military retirees with TRICARE For Life are a third case; see Veterans.

If you lean toward a supplement, there is a second deadline that is easy to miss: your Medigap open enrollment is its own six-month window, separate from the seven-month one above, and in Hawaii it does not repeat. Our research site sets the two side by side — turning 65 in Hawaii.

4. Retiring from the state or a county: what EUTF requires

5. Deadlines that carry lifelong penalties

6. Still working at 65?

Hawaii’s Prepaid Health Care Act requires employers to provide health coverage to employees who work 20 or more hours a week, so most people working at 65 have an employer plan. Whether you can delay Part B without penalty depends on the federal rule: if the employer has 20 or more employees, the employer plan pays first and you can usually delay Part B and get an eight-month Special Enrollment Period when you stop working; if it has fewer than 20, Medicare pays first and you should enroll in Parts A and B at 65 to avoid gaps. A retiree plan or COBRA does not count as active employment. It is worth a quick conversation before you decide, and a form (CMS-L564) from your employer when you do enroll.

7. A simple checklist

• Mark your 7-month IEP on the calendar (it starts 3 months before your birthday month).
• Decide on Part B based on whether you have other creditable coverage — and if you are an EUTF retiree, enroll and send the proof.
• Decide whether you are staying with Kaiser (Senior Advantage) or choosing between HMSA, a national plan and a Medigap policy.
• Check that your doctors and prescriptions are covered before you enroll, and that the plan reaches the island you get specialty care on.
• If you live on a neighbor island or travel to the mainland, read the Neighbor Islands guide first; if you are a veteran, see how TRICARE or VA benefits coordinate; if you have Med-QUEST, see Med-QUEST and the Medicare Savings Programs.
• Estimate your costs on our 2026 costs & IRMAA page.

None of this has to be done alone. We help people across Hawaii sort through it every day — clearly, patiently, and at no cost to you. Hawaii SHIP (1-888-875-9229) offers free, unbiased state counseling as well.