When you take out private medical insurance, the insurer needs to decide how to treat your medical history, and there are two main ways of doing it: moratorium underwriting and full medical underwriting. The choice affects what is covered and how. This guide explains moratorium versus full medical underwriting in plain English.

Why underwriting matters

Underwriting is how an insurer assesses your health when you take out cover, and it determines how your pre-existing conditions are handled. Since pre-existing conditions are a major factor in what PMI will and will not pay for, the underwriting method you choose has a big effect on your cover. Getting to grips with the two main approaches helps you choose the one that suits your health and your preference for certainty, as our guide to what PMI does not cover touches on.

Moratorium underwriting

With moratorium underwriting, you do not answer detailed medical questions when you join. Instead, the policy automatically excludes any pre-existing conditions you had within a set period before joining, often the previous five years. The appeal is simplicity: there is no lengthy medical history to complete upfront. The trade-off is less certainty, because exactly which conditions count as pre-existing may only become clear when you make a claim and the insurer reviews your history.

How conditions can become covered

A key feature of moratorium underwriting is that an excluded pre-existing condition can become covered later. Typically, if you go a continuous period, often two years, without symptoms, treatment, medication or advice for that condition after joining, it may then be covered. This rolling approach means some past conditions can come back into cover over time, which is an advantage of the moratorium approach for people whose past conditions are no longer troubling them.

Full medical underwriting

With full medical underwriting, you provide details of your medical history when you apply, and the insurer assesses it and tells you exactly what is and is not covered from the outset. This takes more effort upfront, but it gives you certainty: you know precisely where you stand before you need to claim. Any exclusions are spelled out clearly, so there are no surprises later about whether a particular condition is covered.

The trade-off: certainty versus convenience

The core difference is certainty versus convenience. Moratorium is quicker and easier to set up, but you may not know exactly what is excluded until a claim. Full medical underwriting takes more effort at the start but removes that uncertainty, which many people value, especially if they have a medical history they want clarity on. Neither is simply better; the right choice depends on how much you value upfront certainty against ease of joining.

Which suits whom

Moratorium underwriting can suit people in good health with little relevant medical history, who want a quick, simple application and are comfortable with how it handles past conditions. Full medical underwriting tends to suit people with a more complex medical history, who want to know exactly what is covered before committing. If certainty matters to you, the extra effort of full underwriting is often worthwhile, as it leaves no doubt at claim time.

Switching and your underwriting

If you already have PMI and want to switch insurer, underwriting matters again. A new insurer may treat conditions that arose under your old policy as pre-existing, potentially leaving you without cover for them. To avoid this, some insurers offer to continue your existing terms, known as continued personal medical exclusions, so conditions covered before remain covered. Always check how a new policy would handle your history before switching, as our guide to why premiums rise notes.

Be honest either way

Whichever underwriting you choose, honesty is essential. With full underwriting you must disclose your history accurately, and with moratorium you must not misrepresent your health if asked. As with all insurance, non-disclosure can lead to claims being refused. Giving accurate information ensures your cover is reliable and that, when you do need to claim, the process is straightforward rather than derailed by questions about what you did or did not declare.

An example of how moratorium works

Suppose you had treatment for a knee problem two years before taking out a moratorium policy. At the start, that knee would be excluded as a pre-existing condition. If, after joining, you then go a continuous period, often two years, without symptoms, treatment or advice for the knee, it could become covered from that point. This rolling feature is what allows past conditions to come back into cover under a moratorium, provided they genuinely stay quiet.

What counts as a pre-existing condition

A pre-existing condition is generally one you have had symptoms, treatment, medication or advice for within a defined period before joining, often the previous five years under moratorium underwriting. The definition can be broader than people expect, capturing conditions you might not think of as significant. This is why understanding how your insurer defines pre-existing conditions, and being honest about your history, is so important to avoid a claim being unexpectedly declined later.

Each person is assessed individually

On a family or couple's policy, each person's medical history is considered separately, so the exclusions that apply to one member may not apply to another. One partner might have a condition excluded while the other has none. When taking out cover for more than one person, it is worth being aware that the underwriting applies individually, so the policy can effectively offer different cover to different family members depending on their health.

Getting advice on underwriting

Choosing between moratorium and full medical underwriting can be tricky, particularly if you have a complex medical history. A specialist health insurance broker can explain how different insurers would treat your conditions and which underwriting approach suits you, sometimes sparing you exclusions you could have avoided. There is often no extra cost to using a broker, since they are usually paid by the insurer, and their knowledge of how different insurers assess medical histories can be genuinely valuable. For anything beyond a straightforward case, taking advice before you commit is well worth it.

Whichever route you choose, the goal is the same: to know exactly where you stand on your medical history, so that when you need to claim, your cover responds smoothly without any unwelcome surprises.

In short

Moratorium underwriting needs no upfront medical questions but automatically excludes recent pre-existing conditions, which can become covered after a symptom-free period, often two years. Full medical underwriting requires you to disclose your history upfront, giving certainty about exactly what is covered from the start. Moratorium is convenient; full underwriting offers clarity. Choose based on your medical history and how much certainty you want, and always provide honest information.

Where to get help and next steps

Read what PMI does not cover and private medical insurance explained for context, and is private health insurance worth it to weigh up the product. This is general information, not medical or financial advice.