Medicare by region · Kaneohe, Kailua, Waimanalo & the Koolau coast
Kaneohe, Kailua and Waimanalo under the Koolau cliffs — Adventist Health Castle close to home, Queen’s and Kaiser over the Pali, and Marine Corps Base Hawaii’s retirees at Kaneohe Bay.
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Medicare in the region
The Windward side has Honolulu County’s full plan menu and a care map defined by the mountains. Adventist Health Castle in Kailua handles most hospital care for Kaneohe, Kailua and Waimanalo; anything more specialized means the Pali or Likelike Highway to Queen’s, Straub or Kaiser’s Moanalua Medical Center. Whether a plan’s network includes Castle, and whether it includes the Honolulu hospitals you would be referred to, is the first thing we check.
Marine Corps Base Hawaii shapes the rest. Retired Marines and sailors around Kaneohe Bay reach 65 with TRICARE For Life, and for them the question is not Medigap versus Advantage but whether an MA-only plan’s extras are worth it.
Local plans to know: Adventist Health Castle in Kailua is the Windward side’s hospital and contracts through HMSA and the national carriers; Kaiser members cross the Pali to Moanalua. Marine Corps Base Hawaii at Kaneohe Bay adds a TRICARE For Life community whose “best plan” looks different from a civilian neighbor’s.
Counties: Honolulu (Windward Oahu: Kaneohe, Kailua, Lanikai, Waimanalo, Kahaluu, Waiahole, Kaaawa, Hauula).
Each contracts differently with each plan; we check your doctors first.
Turning 65? Your Initial Enrollment Period is the 7 months around your birthday. Already on Medicare? The Annual Election Period is Oct 15–Dec 7, and Medicare Advantage Open Enrollment runs Jan 1–Mar 31. Moving to another island or losing a plan opens a Special Enrollment Period.
Your options
All-in-one Part C plans, often $0 premium, that use a local network — in Hawaii that usually means choosing between Kaiser, HMSA and a few national carriers, island by island.
How Advantage worksMedigap pairs with Original Medicare and lets you see any provider that accepts Medicare — Queen’s, Straub, Hilo Benioff, or a specialist on the mainland.
How Medigap worksStandalone drug coverage chosen around your medications and pharmacy. 2026 out-of-pocket cap: $2,100.
How Part D worksAdvantage plans built for a chronic condition, for nursing-facility care, or for people with both Medicare and Med-QUEST.
About SNPsQuestions from the Windward side
Honolulu County’s full menu: Kaiser Permanente, HMSA and national-carrier Advantage plans, every Medigap company licensed in Hawaii, and all Part D plans. We confirm Adventist Health Castle and your Honolulu specialists are in the network before you enroll.
Adventist Health Castle contracts with some Advantage plans and not others, and the list changes each year. With Original Medicare and a Medigap policy there is no network to check. We confirm before you enroll.
Nothing. Independent agents are paid by the carriers when you enroll, so comparing plans and reviewing your coverage each year is free to you.
Ready when you are
A short, friendly conversation — no pressure, no cost.
Written and reviewed by Darin Weidauer — licensed insurance agent (NPN 18580338, HI License #18580338), Gerontologist (USC Leonard Davis School of Gerontology), MBA, Registered Social Security Analyst, and 22-year U.S. Air Force veteran.Last reviewed September 13, 2026. Plan availability, benefits and costs change every plan year — verify current details at Medicare.gov, 1-800-MEDICARE, or Hawaii SHIP at 1-888-875-9229.