Your Medicare Advantage Plan Stops at the County Line. Original Medicare Doesn’t

A 68-year-old retiree in Phoenix spends three months every summer with her daughter in Vermont. She likes her Medicare Advantage HMO. The premium is $0, the dental benefit is real, and her doctors are five minutes from home. Then she tears a meniscus hiking in Stowe. The emergency room visit is covered. The orthopedic follow-up, the MRI, and the outpatient surgery she would prefer to schedule before flying back? Out of network, and her HMO does not pay for non-emergency care outside its service area.

This is the gap most Medicare Advantage enrollees never test until they need it. If you spend the year inside one county, it will not matter. If you travel, snowbird, visit family for weeks at a time, or split time between two states, it is the single most important mechanic in your plan.

The service-area rule, in plain numbers

Medicare Advantage plans are private insurance arrangements built around provider networks and defined service areas. HMOs are generally the most restrictive: non-emergency care received outside the network is typically not covered. PPOs usually allow out-of-network care but at higher cost-sharing. Emergency and urgently needed care are covered anywhere in the United States, but the coverage rules for follow-up treatment depend on the plan’s network and benefit structure.

That distinction is where travel can become expensive. An emergency room visit for chest pain while visiting another state will generally be covered. The cardiologist follow-up appointments, stress testing, and any procedures scheduled afterward may be subject to network restrictions. For an HMO enrollee, that can mean returning home for treatment or facing significant out-of-pocket costs if care is obtained outside the network.

The out-of-pocket maximum adds another layer to the calculation. In 2026, the federal maximum for in-network Medicare Advantage spending is $9,250. PPO plans that cover out-of-network care may have a combined in-network and out-of-network maximum as high as $13,900, although many plans set lower limits. The difference between those caps can be substantial for a traveller who receives care outside the network. Part D prescription drug spending remains separate and does not count toward the Medicare Advantage medical out-of-pocket maximum.

Original Medicare does not have a service area

Original Medicare (Part A and Part B) is accepted by any provider in the country that takes Medicare assignment, and the vast majority do. As Suze Orman put it on her podcast, “with original Medicare, any specialist who accepts Medicare and most do, will be covered.” No referral. No prior authorization for a specialist. No question about whether the orthopedic surgeon 1,800 miles from your house is “in network,” because there is no network.

The tradeoff is the premium stack. Original Medicare alone has no out-of-pocket maximum, which is why most enrollees add a Medigap policy (Plan G is the most common) and a standalone Part D plan. That stack runs roughly $150 to $300 per month in supplement premium depending on your state and age, on top of the standard 2026 Part B premium of $202.90. In exchange, your coverage works the same in Burlington, Vermont as it does in Phoenix.

The trap on the way back

Switching from Original Medicare to a $0-premium Advantage plan is generally straightforward. Switching back later can be more complicated. Outside the initial Medigap open enrollment period, and outside states that provide broader guaranteed-issue protections, insurers may medically underwrite a Medigap application and can charge higher premiums or decline coverage based on health status. A traveler who chooses Medicare Advantage at 65 and later develops a chronic condition may find that obtaining Medigap coverage is more difficult than expected.

Foreign travel is a separate gap. Original Medicare does not cover care outside the United States either. Some Medigap plans include limited foreign travel emergency benefits; some Advantage plans add a small worldwide emergency rider. A long trip abroad calls for a separate travel medical policy.

What to do

If you spend more than a few weeks a year outside your plan’s service area, three actions matter:

• Pull your plan’s Evidence of Coverage and find the service area map and the out-of-network cost-sharing table. If you are on an HMO and travel regularly, switch to a PPO during the October 15 to December 7 open enrollment window, or move to Original Medicare plus Medigap if you can still pass underwriting.
• If you are still inside your 6-month Medigap open enrollment window, price Plan G against your current Advantage plan before the window closes. Guaranteed issue is the leverage you lose once the clock runs out.
• Buy a travel medical policy for any trip outside the U.S., regardless of which side of Medicare you are on. A two-week policy runs about the cost of a tank of gas and covers the gap both structures leave open.

Source note: 2026 Medicare premium and deductible figures from the CMS “2026 Medicare Parts A & B Premiums and Deductibles” fact sheet. Medicare Advantage out-of-pocket maximum figures reflect the 2026 CMS standard and combined caps for MA and MA-PPO plans.