Idaho has 28 Medicare Advantage plans available statewide in 2026, a small, tightly held market compared to larger states. About 200,000 Idahoans are enrolled in a Medicare Advantage plan in 2026, roughly 49% of the state's Medicare-eligible population, close to but still below the national MA penetration rate of about 54%. The statewide average monthly premium is $19, noticeably higher than the national MA average of $14, reflecting Idaho's smaller carrier pool and thinner competition outside the Boise metro area.
Humana carries the highest average Star Rating among Idaho carriers in 2026 (4.5 stars) and offers the most plans statewide (9 of the state's 28). Blue Cross of Idaho, the state's largest domestic insurer, and Regence BlueShield of Idaho, a Cambia Health Solutions affiliate, both hold 4.0-star averages and anchor the broadest rural networks in the Magic Valley, Treasure Valley, and North Idaho panhandle. UnitedHealthcare rounds out the field with the state's lowest average premium and several $0-premium HMO options concentrated in Ada and Canyon counties.
Idaho Medicare beneficiaries shopping in 2026 will find this guide covers how many plans are available, which carriers dominate, what to look for when comparing, county-level variance, and the key enrollment dates. The Annual Election Period is October 15 to December 7, 2026, with coverage starting January 1, 2027.
2026 Medicare Advantage Market Overview in Idaho
In 2026, Idaho has 28 Medicare Advantage plans available, with 200,000 beneficiaries enrolled (49% MA penetration). The average monthly premium is $19 and the statewide average Star Rating is 4.0.
Top Medicare Advantage carriers in Idaho (2026)| Carrier | Plans | Avg Star Rating | Avg Premium |
|---|
| Humana | 9 | 4.5 | $15/mo |
| Blue Cross of Idaho | 7 | 4.0 | $25/mo |
| Regence BlueShield of Idaho | 4 | 4.0 | $22/mo |
| UnitedHealthcare | 5 | 4.0 | $12/mo |
| Aetna | 2 | 3.5 | $26/mo |
| Wellcare | 1 | 3.5 | $28/mo |
Source: KFF Medicare Advantage 2026 Idaho Spotlight, CMS Medicare Plan Finder Q4 2025
Plan Types in Idaho: HMO vs PPO vs SNP
Medicare Advantage plan-type breakdown in Idaho| Plan Type | Plans Available | Avg Premium | Best For |
|---|
| HMO | 14 | $14/mo | Lower premiums in Boise metro and other Idaho population centers |
| PPO | 10 | $24/mo | Flexibility to travel between rural Idaho counties and regional hospitals |
| Special Needs Plan (SNP) | 3 | $0/mo | Dual-eligible (Idaho Medicaid + Medicare), chronic conditions, institutional care |
| Medical Savings Account (MSA) | 1 | $0/mo | High-deductible plan with bank account; rare in Idaho |
HMO plans make up half of Idaho's 28 Medicare Advantage plans in 2026, concentrated in Ada, Canyon, and Kootenai counties. PPO plans account for a larger share of the Idaho market than in most states because they cover the state's rural regional hospitals.
Source: KFF Medicare Advantage 2026 Idaho Spotlight, CMS Medicare Plan Finder
County-Level Variance in Idaho
Plan availability in Idaho varies sharply by county. The Boise metro (Ada and Canyon counties) has the state's deepest plan menus, while several rural Idaho counties in the central mountains have very few Medicare Advantage options, and a handful have none at all. Idaho residents in those counties typically rely on Original Medicare plus a Medigap policy and a standalone Part D drug plan.
Plan count and average premium by county in Idaho| County | Plans Available | Avg Premium |
|---|
| Ada County | 22 | $10/mo |
| Canyon County | 18 | $12/mo |
| Kootenai County | 14 | $15/mo |
| Bonneville County | 9 | $19/mo |
| Custer County | 3 | $34/mo |
Plan counts and premiums are from CMS Medicare Plan Finder Q4 2025 for Idaho. A small number of rural Idaho counties currently have no Medicare Advantage plan offerings at all. Run a personalized search at medicare.gov to see exact plans for your ZIP code.
Source: CMS Medicare Plan Finder Q4 2025, Idaho county data
What to Look For in a Medicare Advantage Plan in Idaho
Picking a Medicare Advantage plan in Idaho is not just about premium. Here's what matters for shopping in 2026:
- Provider network. Idaho Medicare Advantage networks vary significantly by county. Confirm your primary care physician, specialists, and preferred hospital are all in-network before enrolling, especially if you regularly travel to Boise, Salt Lake City, or Spokane for specialty care.
- Prescription drug coverage (formulary). Most Idaho Medicare Advantage plans include Part D. Check that your specific medications are on the plan's formulary at a tier you can afford. The 2026 Part D out-of-pocket cap is $2,100 across all plans nationwide.
- Star Ratings. CMS rates plans 1 to 5 stars annually on quality of care, member experience, and customer service. Idaho's statewide average is about 4.0 stars for 2026, and Humana consistently posts the highest Idaho scores at 4.5 stars.
- Extras (dental, vision, hearing, transportation, OTC allowance). Idaho Medicare Advantage carriers differ widely on supplemental benefits. Some Boise-area HMOs include generous dental and hearing aid allowances, while rural PPOs may offer thinner extras in exchange for a broader travel network.
- Maximum out-of-pocket (MOOP). Medicare Advantage plans cap your annual in-network out-of-pocket spending. The 2026 federal MOOP ceiling for in-network MA is $9,250 (down $100 from $9,350 in 2025); Idaho plans commonly set it in the $5,000 to $8,000 range. Original Medicare has no MOOP.
- Prior authorization burden. Idaho Medicare Advantage plans can require prior authorization for surgeries, advanced imaging, and specialist referrals, which can add delays for residents who must travel long distances for that care. Ask how often the plan requires prior authorization and check denial rates published by CMS.
Key Medicare Dates in Idaho
Idaho Medicare and Medicare Advantage have several enrollment windows in 2026. Miss them and you may face delays in coverage or, for Part B, a permanent late-enrollment penalty.
- Annual Election Period (AEP): October 15 - December 7, 2026 — Switch between Original Medicare and MA, change MA plans, or change Part D plans. Coverage starts January 1, 2027.
- Medicare Advantage Open Enrollment Period (MA OEP): January 1 - March 31, 2026 — If you're already in an Idaho MA plan, you can switch to a different MA plan or return to Original Medicare. One switch only.
- Initial Enrollment Period (IEP): 7-month window around your 65th birthday — Starts 3 months before your 65th birthday month, includes the birth month, and runs 3 months after. Enroll in Medicare Parts A and B, then choose MA or Original Medicare plus Part D.
- Special Enrollment Periods (SEPs): Varies by qualifying event — Triggered by moving out of your plan's Idaho service area, losing employer coverage, qualifying for Idaho Medicaid (dual eligible), or other life events. Typically a 2-3 month window.
Notable Extras in Idaho Plans
Idaho Medicare Advantage plans and the state's Medicaid program offer several Idaho-specific features worth knowing about:
- Idaho Medicaid dual-eligible coordination programs: Idaho coordinates Medicare and Medicaid benefits for dual-eligible residents through two state programs: the Medicare-Medicaid Coordinated Plan (MMCP) and Idaho Medicaid Plus (IMPlus), run by the Idaho Department of Health and Welfare, alongside federal Dual Special Needs Plans (D-SNPs) offered directly by MA carriers. None of these options charge a premium to eligible members. Idaho expanded Medicaid eligibility in January 2020 after voters approved Proposition 2, extending coverage to adults earning up to 138% of the federal poverty level and broadening dual-eligible enrollment statewide.
- SHIBA free Medicare counseling: The Idaho Department of Insurance runs SHIBA (Senior Health Insurance Benefits Advisors), the state's federally funded Medicare counseling program, with offices in Boise, Coeur d'Alene, and Pocatello. SHIBA counselors offer free, unbiased plan comparisons and enrollment help by phone, webinar, or in person; call the SHIBA Medicare Helpline at 800-247-4422.
- Rural access and telehealth: Idaho's mountainous, sparsely populated geography means many rural residents drive well over an hour to reach a hospital or specialist. Most Idaho Medicare Advantage plans in 2026 emphasize telehealth visits and mail-order pharmacy at no added cost specifically to reduce that travel burden, and several PPOs are structured to cover regional hub hospitals in Boise, Idaho Falls, Twin Falls, and Coeur d'Alene even outside a member's home county.
- Integrated regional health systems in eastern Idaho: In eastern Idaho counties near the Utah border, such as Bonneville and Bannock, SelectHealth (affiliated with Intermountain Health) offers an integrated care model similar in spirit to Kaiser Permanente's, coordinating hospitals, clinics, and pharmacy under one system. Idaho residents in that corridor should confirm whether an integrated-system plan or a broader-network PPO better matches where they already receive care.
Medicare Advantage vs Original Medicare in Idaho
Idaho Medicare beneficiaries choosing between Original Medicare and Medicare Advantage face a real tradeoff in 2026. Original Medicare (Parts A and B) plus a Medigap supplement and a standalone Part D drug plan gives Idaho residents nationwide provider freedom and no prior authorization for most services, but the combined Medigap and Part D premium in Idaho commonly runs $180 to $350 a month. Medicare Advantage plans bundle hospital, medical, and usually drug coverage into one plan with a statewide average premium of $19 a month in 2026, though several Boise-area HMOs charge $0.
Idaho's rural geography sharpens this choice. Residents of Custer, Lemhi, or Clark counties who need specialist care in Boise, Salt Lake City, or Spokane may value Original Medicare's nationwide network more than Treasure Valley retirees who rarely leave the Boise metro. Idaho Medicare Advantage plans typically restrict coverage to in-state or in-region provider networks, so anyone who travels frequently or splits time out of state should weigh Original Medicare plus Medigap more heavily.
Idaho Medicare beneficiaries who switch from Medicare Advantage back to Original Medicare during the Annual Election Period or the Medicare Advantage Open Enrollment Period should apply for Medigap immediately. Idaho insurers can medically underwrite Medigap applications outside your initial Medigap open enrollment window or a guaranteed issue event, so a pre-existing condition could mean denial or a higher premium.
How Star Ratings work in Idaho
Idaho Medicare Advantage Star Ratings, like every state's, are published by CMS every October and graded 1 to 5 stars across roughly 40 quality measures covering chronic disease management, member complaints, customer service, and Part D drug safety. Plans that score 4 stars or higher receive CMS quality bonus payments, which typically translate into richer supplemental benefits, such as dental, vision, hearing, and OTC allowances, the following plan year.
Idaho's 2026 statewide weighted-average Star Rating is about 4.0, above the national average near 3.8. Humana carries the highest Idaho rating at 4.5 stars, though Idaho currently has no plan rated the rare full 5 stars, which would otherwise trigger a year-round Special Enrollment Period. Blue Cross of Idaho, Regence BlueShield of Idaho, and UnitedHealthcare each hold a solid 4.0-star average in 2026, while Aetna and Wellcare trail at 3.5 stars.
How to enroll in Idaho Medicare Advantage
Idaho residents enrolling in Medicare Advantage in 2026 follow the same federal process used nationwide, though plan availability differs sharply by county. Start at medicare.gov/plan-compare, CMS's personalized plan finder keyed to your Idaho ZIP code, to see the exact plans, premiums, and Star Ratings available where you live.
- Step 1: Confirm you are already enrolled in Medicare Part A and Part B. You must have both before joining a Medicare Advantage plan. Idaho residents newly turning 65 can use their Initial Enrollment Period to enroll in Parts A and B first.
- Step 2: Gather your documents. You will need: your Medicare card (showing your Medicare number and Part A/B effective dates), your Idaho ZIP code (for plan availability), a list of current prescriptions (for formulary lookup), a list of current doctors and hospitals (for network check), and your Idaho Medicaid card if you are dual-eligible.
- Step 3: Compare plans at medicare.gov/plan-compare. Filter by your Idaho ZIP code. Sort by Star Rating, monthly premium, total estimated annual cost, or maximum out-of-pocket. Idaho residents should also contact SHIBA (Senior Health Insurance Benefits Advisors) for free, unbiased counseling before deciding.
- Step 4: Apply. You can enroll directly through medicare.gov, by calling 1-800-MEDICARE (1-800-633-4227), or through the carrier directly. Most online enrollments take 10 to 15 minutes.
- Step 5: Confirm your coverage start date. AEP enrollments start January 1, 2027. SEP enrollments typically start the first of the month after you enroll. You will receive a member ID card and Evidence of Coverage from the carrier within 7 to 10 business days.
- Common reasons Idaho Medicare Advantage applications are delayed or denied: late Part B enrollment, a ZIP code outside the plan's Idaho service area (common in rural counties with limited plan menus), missing Idaho Medicaid eligibility documentation for D-SNP applicants, identity verification issues, and applying for a plan restricted to a different Idaho county's network.
$0 premium plans in Idaho for 2026
Idaho has a smaller slate of $0 monthly premium Medicare Advantage plans in 2026 than larger states, concentrated in the Boise metro (Ada and Canyon counties) where UnitedHealthcare and Humana compete hardest. $0 premium does not mean $0 cost: Idaho enrollees in $0 premium plans still pay the 2026 Part B premium of $202.90 a month plus any drug copays, deductibles, and cost sharing built into the plan.
$0 premium plans in Idaho for 2026 detail| Carrier | Plan Type | Star Rating | Counties Available |
|---|
| UnitedHealthcare | HMO | 4.0 | Ada, Canyon, Kootenai |
| Humana | HMO | 4.5 | Ada, Canyon, Bonneville, Bannock |
| Blue Cross of Idaho | HMO | 4.0 | Ada, Canyon, Twin Falls |
| Regence BlueShield of Idaho | HMO | 4.0 | Ada, Kootenai |
Idaho $0 premium plan availability sample for 2026. Full list at medicare.gov/plan-compare keyed to your ZIP code. Star Ratings reflect the 2026 plan year.
Source: Idaho CMS Medicare Plan Finder Q4 2025
Special Needs Plans and dual eligibility in Idaho
Idaho Medicare beneficiaries who also qualify for Idaho Medicaid are dual-eligible and can enroll in a Dual Special Needs Plan (D-SNP), which coordinates both programs into a single plan with $0 premiums, $0 primary care copays, and typically no prescription drug costs. Idaho also runs two state-specific coordination programs for dual-eligible residents, the Medicare-Medicaid Coordinated Plan (MMCP) and Idaho Medicaid Plus (IMPlus), both administered by the Idaho Department of Health and Welfare at no premium to eligible members.
Idaho also offers a small number of Chronic Condition Special Needs Plans (C-SNPs) for beneficiaries with qualifying conditions such as diabetes or heart failure, and Institutional Special Needs Plans (I-SNPs) for residents of nursing facilities. Idaho dual-eligible beneficiaries get an added enrollment right: they can switch Medicare Advantage plans once per quarter in Q1 through Q3, plus again during AEP, giving more flexibility than beneficiaries who are not dual-eligible.
Frequently Asked Questions
How many Medicare Advantage plans are available in Idaho in 2026?
Idaho has 28 Medicare Advantage plans available statewide in 2026. The exact number available to you depends on your county and ZIP code. The Boise metro (Ada and Canyon counties) offers 18 to 22 plans; rural counties like Custer may have only 2 to 3 plans, and a small number of Idaho counties have no Medicare Advantage plans at all. Run a ZIP-code search at medicare.gov to see your exact options.
What is the average Medicare Advantage premium in Idaho for 2026?
The statewide weighted-average Medicare Advantage premium in Idaho is about $19 per month in 2026, above the national MA average of $14. Several Boise-area HMOs from UnitedHealthcare and Humana charge $0 monthly premium, while rural PPOs with broader travel networks average $24 or more per month.
When can I sign up for Medicare Advantage in Idaho?
The main enrollment window is the Annual Election Period (AEP) from October 15 to December 7, 2026, for coverage starting January 1, 2027. You can also enroll during your 7-month Initial Enrollment Period around your 65th birthday, or during a Special Enrollment Period triggered by events like moving, losing employer coverage, or qualifying for Idaho Medicaid. Existing Idaho MA enrollees can switch plans during the Medicare Advantage Open Enrollment Period (January 1 to March 31, 2026).
Who has the best Medicare Advantage plans in Idaho?
Humana leads Idaho in Star Ratings, with a 4.5-star average across its 9 statewide plans, and offers the most plan choices of any Idaho carrier. Blue Cross of Idaho, the state's largest domestic insurer, and Regence BlueShield of Idaho each hold 4.0-star averages and the broadest rural networks. UnitedHealthcare offers the lowest average premium. The best plan for you depends on your doctors, your medications, and how far you're willing to travel for specialty care.
Can I switch from Medicare Advantage back to Original Medicare in Idaho?
Yes. You can switch back during the Annual Election Period (October 15 to December 7) or the Medicare Advantage Open Enrollment Period (January 1 to March 31). However, returning to Original Medicare does not automatically guarantee you can buy a Medigap policy: Idaho insurers can medically underwrite Medigap applications outside your initial Medigap open enrollment window unless you have a guaranteed issue right, so a pre-existing condition could mean denial or a higher premium. Plan ahead and apply for Medigap immediately after disenrolling.
What is the difference between an HMO and a PPO in Idaho Medicare Advantage?
HMOs (14 of Idaho's 28 plans, about half) require you to use in-network providers and usually need a referral to see a specialist. They offer lower premiums (average $14/mo) and are concentrated in the Boise metro. PPOs (10 plans, about 36%) let you see out-of-network providers at a higher cost share and don't require referrals, which matters in a state where residents often travel between rural counties and regional hub hospitals; PPOs average $24/mo. Choose HMO for lower cost in a dense network; choose PPO for flexibility to travel across Idaho.
Does Medicare Advantage cover prescription drugs in Idaho?
Most Idaho Medicare Advantage plans include Part D prescription drug coverage built in. These are called MA-PD plans. The 2026 Part D annual out-of-pocket maximum is $2,100 across all plans nationwide (set by the Inflation Reduction Act, signed August 16, 2022). Always check the plan's formulary to confirm your specific medications are covered, and at what tier.
Are dental, vision, and hearing covered by Medicare Advantage in Idaho?
Most Idaho Medicare Advantage plans include some level of dental, vision, and hearing benefits, which Original Medicare does not cover. Coverage varies widely: some Boise-metro plans cover cleanings, exams, hearing aids, and prescription eyewear, while some rural PPOs offer thinner extras. Always check the Evidence of Coverage for annual dollar limits and what's actually covered.
What is a Special Needs Plan (SNP) and who qualifies in Idaho?
A Special Needs Plan (SNP) is a type of Medicare Advantage plan designed for people with specific needs. Idaho offers Dual Special Needs Plans (D-SNPs) for residents who qualify for both Medicare and Idaho Medicaid, Chronic Condition Special Needs Plans (C-SNPs) for people with qualifying conditions like diabetes or heart failure, and Institutional Special Needs Plans (I-SNPs) for nursing facility residents. Idaho also runs two additional dual-eligible coordination programs, MMCP and IMPlus, through the Department of Health and Welfare. SNPs made up 3 of Idaho's 28 Medicare Advantage plans in 2026, and most charge $0 premium to eligible members.
