Medicare HMO plans: how they work and what they cost in 2026

This structure is intentional. The HMO model was built around coordinated care: one physician keeps track of your conditions, medications, and test results, and sends you to the right specialist when needed. For people who see several doctors, this can actually reduce duplicated tests and conflicting prescriptions. For people who want direct access to any specialist at any time, the model can feel restrictive.

HMOs are one of several Medicare Advantage plan types. Others include PPOs (Preferred Provider Organizations), which allow out-of-network care at higher cost sharing; PFFS (Private Fee-for-Service) plans; and SNPs (Special Needs Plans), which are designed for people with specific chronic conditions, dual Medicare-Medicaid eligibility, or institutional care needs. HMOs tend to have the tightest networks and, in many markets, the lowest premiums among Advantage plan types.

In short: an HMO delivers full Medicare coverage through a defined network with a PCP coordinating your care, and it generally will not cover out-of-network providers except in emergencies.

Medicare HMOs are still Part C plans, so their cost structure combines Original Medicare rules with plan-level design choices.

Part B premium. You keep paying the standard Part B premium regardless of which HMO you join. In 2026, the standard Part B premium is $202.90 per month. If your 2024 modified adjusted gross income (MAGI) exceeded $109,000 (single) or $218,000 (joint), you also pay an IRMAA (Income-Related Monthly Adjustment Amount) surcharge on top of the standard premium, with higher surcharges at higher income tiers. IRMAA applies to Part D as well.

Plan premium. The HMO itself may charge an additional monthly premium, or it may charge $0. Zero-premium HMO options are common in many markets but availability depends on where you live and the bids the plan filed with CMS. A $0 plan premium does not mean $0 total cost; Part B still applies.

Deductibles and copays. Each HMO sets its own deductible (which may be $0) and its own copay or coinsurance amounts for visits, labs, and procedures. These vary by plan and are not hardcoded here. To find out more about coverage and plan-level cost sharing, please contact us to discuss plan options.

Out-of-pocket maximum. This is where HMOs offer a structural advantage that Original Medicare does not. In 2026, the federal in-network MOOP (Maximum Out-of-Pocket) cap for Medicare Advantage plans is $9,250. Once your in-network spending reaches that ceiling in a calendar year, the plan pays 100% of covered in-network costs for the rest of the year. According to KFF, the 2026 enrollment-weighted average in-network MOOP across Medicare Advantage plans is $5,421, meaning many enrollees face lower caps in practice. The federal combined in-network plus out-of-network MOOP cap is $13,900, though most HMOs do not cover out-of-network care in a way that makes this figure relevant.

For comparison, Original Medicare has no annual out-of-pocket cap. The Part A inpatient deductible is $1,736 per benefit period in 2026, hospital coinsurance runs $434 per day for days 61 to 90 of a benefit period, and after the annual Part B deductible of $283, you pay 20% of every covered outpatient service with no ceiling.

In short: an HMO's biggest financial advantage over Original Medicare is the annual out-of-pocket cap, which in 2026 cannot exceed $9,250 for in-network care under federal rules.

The referral requirement is the feature that surprises new HMO enrollees most often. Referrals from your PCP are required for most specialist visits; walking directly into a specialist's office without a referral usually means the plan will not pay the claim.

Prior authorization (PA) is a separate process. PA requires the plan to approve certain services, devices, or medications before you receive them. Starting in 2026, under CMS rule CMS-0057-F, standard prior-authorization decisions must be issued within 7 calendar days. Expedited (urgent) decisions must come within 72 hours, and any denial must include a specific reason. If a service is denied, you have appeal rights; the plan must explain which criteria were not met.

HMOs also define a geographic service area. If you move out of that area permanently, you typically lose eligibility for the plan and trigger a Special Enrollment Period (SEP) to choose new coverage. Traveling is handled differently: emergency care is covered anywhere in the United States, and most plans cover urgently needed care while you are temporarily outside the service area. Routine care outside the area is generally not covered.

A variant called an HMO-POS (Point of Service) adds a limited out-of-network option, usually with significantly higher cost sharing, for specific services. If flexibility outside the network matters to you, comparing an HMO-POS to a PPO is worth the time.

In short: referrals, prior authorization with a 7-calendar-day standard decision window, and a defined service area are the three structural rules that shape how you use an HMO.

Both HMOs and PPOs are Medicare Advantage plan types, and both carry the 2026 federal MOOP cap. The differences come down to flexibility and, often, cost.

Neither type is universally better. If you have established relationships with specialists inside the HMO's network, the referral requirement may be a minor inconvenience. If you split time between two states or need frequent specialist access without gatekeeping, a PPO's flexibility may justify its higher costs. The right answer depends on your specific providers, conditions, and geography.

In short: HMOs tend to cost less but require referrals and limit out-of-network care; PPOs offer flexibility at higher cost sharing.

You can enroll in a Medicare HMO only during specific windows. Getting the timing right matters because late or missed enrollment can result in permanent penalties or coverage gaps.

Initial Enrollment Period (IEP). Your IEP is seven months long: the three months before your 65th birthday month, your birthday month itself, and the three months after. Enrolling during the first three months of that window generally means coverage begins the month you turn 65.

Annual Enrollment Period (AEP). AEP runs October 15 to December 7 each year. During this window, anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan for the coming January 1.

Medicare Advantage Open Enrollment Period (MA OEP). If you are already enrolled in a Medicare Advantage plan, you can make one switch during January 1 to March 31, including switching to a different HMO, a PPO, or returning to Original Medicare.

Special Enrollment Periods. Certain life events, including moving out of a plan's service area, losing employer coverage, or gaining Medicaid eligibility, trigger SEPs that let you enroll outside the standard windows.

One timing note for people with employer coverage: the Part B SEP begins when employment or employer coverage ends, whichever comes first, and it lasts 8 months. COBRA and retiree coverage do not count as active employer coverage for SEP or penalty purposes. Also, if you are contributing to an HSA (Health Savings Account), any Medicare enrollment, including premium-free Part A, ends your ability to make new HSA contributions, and Part A can backdate up to 6 months.

In short: most people enroll through the IEP (around age 65) or AEP (October 15 to December 7); the MA OEP provides a second chance each January through March for those already in an Advantage plan.

One reason Medicare Advantage HMOs attract enrollment is supplemental benefits that Original Medicare does not cover. These can include dental, vision, hearing, fitness programs, and transportation. Which benefits are available, at what limits, and under what conditions varies by plan. Plan-level benefit amounts are set per plan and render from current plan data, not from this article.

What Original Medicare covers stays constant inside an HMO: hospital stays, outpatient services, preventive care, and prescription drugs if the HMO includes Part D coverage (called an MA-PD plan). Hospice care is still covered under Original Medicare even when you are enrolled in an HMO; the HMO does not take over hospice.

If an HMO does not include drug coverage, you would need a standalone Part D plan. In 2026, no Part D plan may set a deductible above $615, and out-of-pocket spending on covered Part D drugs is capped at $2,100 for the year. After that cap, you pay $0 for covered drugs for the rest of the year.

In short: HMOs often bundle dental, vision, hearing, and drug coverage that Original Medicare does not include, but specific benefit amounts vary by plan and market.