HMO Medicare is a type of Medicare Advantage plan run by private insurance companies, not the government
An HMO (Health Maintenance Organization) Medicare plan is a way to receive your Medicare benefits through a private insurance company instead of through Original Medicare. You still get Part A (hospital) and Part B (doctor) coverage, but the insurance company manages how and where you receive care. You pay a monthly premium to the insurance company, and in exchange, you use only doctors and hospitals in their network — except in emergencies.
The main trade-off is this: HMO plans usually cost less per month than Original Medicare plus a Medigap policy, but they limit where you can go for care. You must choose a primary care doctor from the plan's network, and that doctor must refer you to specialists. If you go to a doctor outside the network (except emergencies), you pay the full cost yourself.
HMO Medicare plans are also called Medicare Advantage plans or Part C plans. They are offered by companies like UnitedHealthcare, Humana, Aetna, and Anthem, though which companies operate in your area depends on where you live.
Key Takeaways
- HMO Medicare plans are sold by private insurance companies and require you to use doctors and hospitals in their network, except in emergencies.
- You must pick a primary care doctor who refers you to specialists; going outside the network without a referral means you pay the full bill.
- Monthly premiums are often lower than Original Medicare plus Medigap, but you may pay more per visit or have limits on which treatments the plan covers.
- You can switch to a different HMO plan or back to Original Medicare during the annual enrollment period (October 15 to December 7) or if you have a may have access to life event.
- HMO plans often include dental, vision, and hearing coverage that Original Medicare does not, though the coverage varies by plan and location.
How the network and referral system works
When you join an HMO Medicare plan, you choose a primary care doctor from the plan's list of in-network providers. This doctor becomes your entry point to the health system. If you need to see a specialist — a cardiologist, orthopedist, or dermatologist — your primary care doctor must refer you. If you see a specialist without a referral, the plan may not pay, and you will owe the bill.
The network is the list of doctors, hospitals, urgent care centers, and other providers that have agreed to work with that insurance company. If a provider is not on the list, they are out-of-network. In an HMO, out-of-network care is your responsibility to pay for, with rare exceptions. Emergency room visits are covered even if the hospital is out-of-network, but you should call your plan afterward to report it.
Different HMO plans have different networks, so the doctors you see now may not be in the plan you choose. Before you join, check whether your current doctors are in-network. Most insurance companies have a searchable provider directory on their website, or you can call the plan directly and ask.
Costs: premiums, deductibles, and copays
HMO Medicare plans charge a monthly premium, which varies by plan and location. Some plans have a $0 premium, meaning you pay nothing monthly beyond your Part B premium to Medicare. Others charge $50 to $200 or more per month. The trade-off is that plans with lower premiums often have higher copays or deductibles.
A copay is a fixed amount you pay when you visit a doctor or pick up a prescription. An HMO might charge $15 for a primary care visit, $40 for a specialist, and $5 for a generic drug. A deductible is the amount you must pay out of your own pocket before the plan starts to pay. Some HMO plans have no deductible; others have a deductible of $500 to $1,000 or more for hospital care.
You also pay an out-of-pocket maximum — a yearly limit on what you will spend on copays and deductibles combined. Once you reach that limit, the plan pays 100% of covered services for the rest of the year. Out-of-pocket maximums for HMO Medicare plans range widely but are capped by Medicare at a certain level each year.
One important difference from Original Medicare: if you use an out-of-network provider without authorization, you pay the full cost, and it does not count toward your out-of-pocket maximum. This is why staying in-network is critical.
What HMO plans cover that Original Medicare does not
Many HMO Medicare plans include benefits that Original Medicare does not cover. Dental care (cleanings, fillings, extractions), vision care (eye exams, glasses, contacts), and hearing aids are common add-ons. Some plans also cover fitness programs, transportation to medical appointments, or over-the-counter health items like pain relievers and vitamins.
However, these extra benefits vary widely from plan to plan and from region to region. One HMO plan in your area might cover dental cleanings twice a year, while another covers them once. Some plans cap dental benefits at $1,000 per year; others offer more. You need to read the plan's summary of benefits to know exactly what is covered.
These extras sound appealing, but they come with limits. Dental coverage under an HMO is usually more limited than a standalone dental plan. Vision coverage often means one eye exam per year and a basic frame or contacts allowance. If you need extensive dental work or have specific vision needs, you may still want to buy a separate dental or vision plan.
When you can join or switch HMO plans
You can join an HMO Medicare plan during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Changes take effect on January 1. This is the main window for switching plans or moving from Original Medicare to an HMO.
If you have a may have access to life event — such as moving to a new state, losing other health coverage, or experiencing a death in the family — you may be able to join or switch plans outside the enrollment period. You usually have 60 days from the event to make the change. Call Medicare at 1-800-MEDICARE to report a may have access to event and see whether you are may be able to access to switch.
If you are already in an HMO and want to switch to a different HMO or back to Original Medicare, you can do so during the Annual Enrollment Period. You do not need a reason. However, if you switch back to Original Medicare, you may want to buy a Medigap policy to cover costs that Original Medicare does not pay. Medigap has its own enrollment rules, and waiting too long can mean higher premiums.
HMO vs. Original Medicare: the main differences
| Feature | HMO Medicare | Original Medicare |
|---|---|---|
| Who provides coverage | Private insurance company | Federal government |
| Monthly premium | Often $0 to $200+ | Part B premium only (about $165 in 2024) |
| Network requirement | Must use in-network doctors | Can see any doctor who accepts Medicare |
| Referrals | Required for specialists | Not required |
| Dental, vision, hearing | Often included | Not covered |
| Out-of-pocket maximum | Yes, capped by Medicare | No limit (unless you have Medigap) |
| Prescription drug coverage | Usually included | Must buy Part D separately |
Common mistakes to avoid when choosing an HMO plan
The biggest mistake is not checking whether your current doctors are in-network before you join. Many people choose a plan based on premium alone and then discover their cardiologist or rheumatologist is out-of-network. By the time they realize it, the enrollment period has passed. Before you join, call your doctors' offices and ask whether they accept the specific HMO plan you are considering.
Another mistake is assuming that a $0 premium plan is always the cheapest option. A plan with no monthly premium might have a $500 deductible and $50 copays, while a plan with a $50 monthly premium might have no deductible and $15 copays. Do the math: if you visit the doctor 10 times a year, which plan costs less overall? The answer depends on your health and how often you seek care.
A third mistake is not reading the plan's formulary — the list of prescription drugs the plan covers. If you take a specific medication, check whether it is on the formulary and at what tier (tier 1 drugs are cheapest, tier 5 are most expensive). Some plans do not cover certain drugs, or they require you to try a cheaper drug first before they will pay for the one your doctor prescribed.
Finally, do not assume that extra benefits like dental or vision are a good deal without comparing them to standalone plans. If you need significant dental work, a standalone dental plan might cover more and cost less than the dental benefit in an HMO.
Frequently Asked Questions
Can I use my HMO Medicare plan if I travel out of state?
Most HMO plans only cover care within their service area, which is usually your state or a region within your state. If you travel out of state, you may have limited or no coverage except for emergencies. Some HMO plans offer out-of-area coverage for urgent or emergency care, but you should check your plan's rules before you travel. If you spend winters in another state, you may need to switch to a plan that covers both locations or use Original Medicare instead.
What happens to my HMO coverage if I move to a different state?
Your HMO plan will not work in a new state if that insurance company does not operate there. When you move, you have 60 days to join a new plan in your new state. This is considered a may have access to life event. Contact Medicare or your new state's health insurance program to see which HMO plans are available in your new location. You can also switch to Original Medicare if you prefer not to join a new HMO.
Do I still pay my Part B premium if I join an HMO Medicare plan?
Yes. Even if your HMO plan has a $0 premium, you still pay your Part B premium to Medicare each month. Your Part B premium is separate from any premium the HMO charges. Part B covers doctor visits and outpatient services, and you must have it to join any Medicare Advantage plan, including an HMO.
Can I switch from an HMO back to Original Medicare anytime I want?
You can switch back to Original Medicare during the Annual Enrollment Period (October 15 to December 7) without any reason. If you have a may have access to life event, you may be able to switch outside the enrollment period. However, if you switch back to Original Medicare, you should also buy a Medigap policy to cover costs that Original Medicare does not pay. Medigap has its own enrollment rules, and if you wait too long, you may pay higher premiums.
What if my HMO plan is discontinued?
If your HMO plan is discontinued, Medicare will notify you in advance, usually several months before the plan ends. You will have the chance to switch to another HMO plan or to Original Medicare without a penalty. This is treated as a may have access to event, so you can make the change outside the normal enrollment period. Medicare will send you information about your options and the important date to choose a new plan.