Short-Term Plans vs ACA Plans: What You Give Up and What You Get

At a glance

• Who can buy: ACA plans accept everyone. Short-term plans are medically underwritten and can decline you.
• Pre-existing conditions: ACA plans cover them. Short-term plans generally exclude anything treated or diagnosed before the plan started.
• Required benefits: ACA plans must cover the ten essential health benefits. Short-term plans choose what to cover, and maternity, mental health and prescriptions are often limited or excluded.
• Limits: ACA plans have no annual or lifetime dollar limits on essential benefits. Short-term plans commonly have a maximum benefit.
• When you can buy: ACA plans during open enrollment or a special enrollment period. Short-term plans any time, often starting within days.
• Length: ACA plans renew each year. Short-term plans have a fixed term, with total length set by federal and state rules.
• Tax credit: ACA plans can qualify for the premium tax credit. Short-term plans never do.
• Price driver: ACA plans are priced on age, zip code and tobacco, then reduced by income-based help. Short-term plans are priced on age, zip code and health, with no income-based help.

How long a short-term plan can last

The rules have changed several times. A 2024 federal rule limited new short-term plans to an initial term of three months and four months in total. In 2025, the federal agencies said they would not prioritize enforcing that limit while they reconsider it. States set their own limits on top of the federal rule. Florida law defines short-term coverage as an initial term of less than 12 months and a total of up to 36 months including renewals, and several carriers sell multi-month and multi-year short-term plans in Florida again.

Other states are stricter, and a few ban short-term plans entirely. I confirm what is allowed in your state before quoting one.

What "does not cover pre-existing conditions" really means

Short-term plans typically use a look-back period. If you saw a doctor, were diagnosed, took medication or had symptoms of a condition during that window before the plan started, claims related to it can be denied. Some plans also review medical records after a large claim to check whether the condition began before coverage. This is the part that surprises people most, and it is why a short-term plan is only as good as your health history is clean.

Benefit maximums

Most short-term plans cap what they will pay in total, per condition or both. A cap that sounds large can be reached quickly with a hospitalization, cancer treatment or a premature birth. ACA plans have an out-of-pocket maximum for you and no dollar cap on what the plan pays for essential benefits.

Where short-term plans fit

1. A gap with an end date. For example, a new job with a 60 or 90 day waiting period for benefits.
2. A missed open enrollment, if you are healthy and need something until the next window or until a private plan is approved.
3. Between COBRA and something better, when COBRA is unaffordable and the gap is short.

The missed open enrollment guide covers these timing cases in more detail.

Where ACA plans fit

1. Any ongoing condition, prescription or treatment.
2. Pregnancy, or a pregnancy in the next year or two.
3. Income that qualifies for a meaningful tax credit, which can make an ACA plan cheaper than short-term even before you count the better coverage.
4. Anyone who needs coverage that cannot be rescinded or capped if something serious happens.

The option most people skip

For many healthy people, the real comparison is not short-term versus ACA. It is short-term versus a private, medically underwritten plan. Like short-term plans, private plans are underwritten and enroll year-round. Unlike short-term plans, they are designed as long-term, renewable coverage, usually without the tight benefit caps, and often with a national PPO network. They cost more than short-term and are frequently less than an unsubsidized ACA plan for a healthy person. The private versus Marketplace guide explains how they compare.

Special enrollment and short-term plans

Losing a short-term plan does not open a Marketplace special enrollment period, because short-term coverage does not count as minimum essential coverage. If you buy a short-term plan in February and it ends in August, you may not be able to get an ACA plan until the next open enrollment. Plan the end date of any short-term policy so it reaches either open enrollment or another coverage you know you can get.

A quick decision guide

• Healthy, gap of a few months, defined end date: short-term may be enough.
• Healthy, need coverage indefinitely, income above the subsidy range: price a private, medically underwritten plan first.
• Any health condition, possible pregnancy or income that qualifies for help: choose an ACA plan.
• Not sure: price all three before you buy anything.

A cautionary example

A healthy 41-year-old real estate agent in St. Petersburg buys a short-term plan in March because it is the lowest premium she can find. In July she is diagnosed with a condition that requires surgery. The carrier reviews her records and finds a doctor visit for related symptoms the previous fall, inside the plan's look-back window, and denies the claim as pre-existing. She cannot switch to a Marketplace plan until open enrollment, because a diagnosis is not a qualifying event.

On a private, medically underwritten plan approved after full underwriting, how a new diagnosis is handled depends on that plan's terms, because the carrier reviews her history before issuing the policy. On an ACA plan, she would have been covered regardless of history. The premium difference she saved in March is small next to the bill she faces in July. This is not a rare story, and it is why I ask detailed questions before I quote a short-term plan.

Questions to ask the carrier

• How long is the pre-existing condition look-back period?
• What is the maximum the plan pays in total, and is there a per-condition limit?
• Are prescription drugs covered, and how?
• Is mental health care covered?
• Is maternity care covered, or excluded?
• Can the plan be renewed, and does renewal require new health questions?
• Does the plan review medical records after a claim?

If you cannot get clear answers in writing, do not buy the plan.

When your short-term plan is ending

Plan the exit before you buy. Ideally the short-term plan ends the day before one of these starts:

1. An ACA plan chosen during open enrollment, starting January 1 or February 1.
2. A new employer plan after its waiting period.
3. A private, medically underwritten plan you have already been approved for.

If none of those will be ready, ask whether the plan can be renewed and whether renewal needs new underwriting. In Florida, multi-month and multi-year terms are allowed again, which helps, but a renewal that requires new health questions may not be available if your health has changed.

Before you buy any short-term plan

1. Read the pre-existing condition definition and the look-back period.
2. Find the maximum benefit and the per-condition limits.
3. Check what is excluded: maternity, mental health, prescriptions, outpatient drugs.
4. Confirm the term length and whether renewal requires new health questions.
5. Make sure the end date lines up with open enrollment or your next coverage.

I sell all three, ACA, private medically underwritten and short-term, and I will tell you plainly when a short-term plan is the wrong tool. Compare them with me or call or text (786) 218-2384. No fee. More on bridge plans is in the short-term health insurance guide, and Florida specifics are on the Florida page.