Which basis suits someone with a complicated medical history?

There is no single right answer, because it depends on the history itself. Full medical underwriting gives written certainty upfront — you find out exactly what is excluded before you commit to the policy, which suits people who want to know where they stand. A moratorium can work well for a short, resolved history, since conditions may become eligible again after a trouble-free period. With a longer or ongoing history, a moratorium’s exclusions may be tested unfavourably only when you try to claim, so asking for written illustrations of how each basis would treat specific conditions is worthwhile before choosing.

What counts towards a moratorium’s trouble-free period?

A trouble-free period generally means a continuous stretch of time without symptoms, treatment, medication or advice connected to the condition in question. A repeat prescription or a routine check-up for that condition typically resets the clock, even if it feels minor. This means a condition managed with ongoing medication may never complete the trouble-free period and so may never become eligible under a moratorium, which is an important practical difference from full medical underwriting, where the position is stated clearly from the outset instead of depending on an ongoing test.

Can I move from one underwriting basis to the other later?

In principle, yes, but it should not be assumed to happen automatically or without consequence. Moving basis, or switching insurer, generally means being underwritten afresh against your current history, so anything that has arisen since your original policy began can become a new exclusion under the new arrangement. Any change should be confirmed in writing before you give up existing cover, and the two underwriting outcomes should be compared side by side rather than assuming the new basis simply continues where the old one left off.

Health insurance

Moratorium vs full medical underwriting: what’s the difference?

The short answer

Moratorium underwriting asks no medical questions but automatically excludes conditions from a recent look-back period until you complete a set trouble-free period. Full medical underwriting asks health questions upfront and states exclusions in writing before you buy. Moratorium is faster; full medical underwriting gives certainty from day one.

Written by Parvoz Haydarov. Reviewed by Dior Teshayev.

Published 15 September 2026. Last reviewed 15 September 2026. Next review due 15 December 2026.

What to know about the difference between moratorium and full medical underwriting

A moratorium asks no medical questions but excludes recent conditions until a trouble-free period passes. Read more
Full medical underwriting asks health questions upfront and states exclusions in writing before you buy. Read more
Moratorium exclusions are only tested properly at claim, which can create uncertainty. Read more
Full medical underwriting trades a longer application for exclusions you know from day one. Read more

Thinking about the difference between moratorium and full medical underwriting

What works well

Moratorium gets cover in force quickly with no medical forms.
Full medical underwriting states exclusions in writing upfront.
A moratorium can lift exclusions after a trouble-free period.

What to watch

Moratorium exclusions are only tested at claim, which can surprise.
Full medical underwriting exclusions are usually permanent.
Switching basis mid-life needs written confirmation of the effect.

Certainty now versus simplicity now

Under a moratorium, the exclusion is mechanical: conditions you had symptoms, treatment or advice for during the look-back period are excluded until you complete a continuous trouble-free period without symptoms, treatment or advice for that condition. Under full medical underwriting, the insurer reviews your declared history and issues written exclusions before the policy starts, so you know precisely where you stand. Neither basis covers everything; they differ in when and how the exclusions are known.

If you have any significant history, ask for written illustrations of how each basis would treat it before choosing — the answer is often different from what either label suggests. Whatever the specifics of the difference between moratorium and full medical underwriting, the discipline that protects you is always the same: get the insurer’s position in writing before treatment, keep the documents, and compare like with like. The CMA’s private healthcare market investigation imposed order-backed requirements on the private hospital market precisely because opacity on price and information harms patients. ^[1] The Private Healthcare Information Network exists to publish comparable performance and pricing information for private hospitals. ^[2]

In practice

The point people miss about a moratorium is that the clock is rolling. The two trouble-free years must be free of treatment, medication and advice for that condition, and a repeat prescription or a check-up counts. A condition managed with ongoing medication may never become eligible, and full medical underwriting will at least tell you that on day one.

PremierPMI advisers

Related guides

Common questions

Which basis suits someone with a complicated medical history?: There is no single right answer, because it depends on the history itself. Full medical underwriting gives written certainty upfront — you find out exactly what is excluded before you commit to the policy, which suits people who want to know where they stand. A moratorium can work well for a short, resolved history, since conditions may become eligible again after a trouble-free period. With a longer or ongoing history, a moratorium’s exclusions may be tested unfavourably only when you try to claim, so asking for written illustrations of how each basis would treat specific conditions is worthwhile before choosing.
What counts towards a moratorium’s trouble-free period?: A trouble-free period generally means a continuous stretch of time without symptoms, treatment, medication or advice connected to the condition in question. A repeat prescription or a routine check-up for that condition typically resets the clock, even if it feels minor. This means a condition managed with ongoing medication may never complete the trouble-free period and so may never become eligible under a moratorium, which is an important practical difference from full medical underwriting, where the position is stated clearly from the outset instead of depending on an ongoing test.
Can I move from one underwriting basis to the other later?: In principle, yes, but it should not be assumed to happen automatically or without consequence. Moving basis, or switching insurer, generally means being underwritten afresh against your current history, so anything that has arisen since your original policy began can become a new exclusion under the new arrangement. Any change should be confirmed in writing before you give up existing cover, and the two underwriting outcomes should be compared side by side rather than assuming the new basis simply continues where the old one left off.

Sources

Competition and Markets Authority. Private Healthcare Market Investigation Order 2014. 1 October 2014 (primary source)
Private Healthcare Information Network. About private hospital pricing in the UK. Updated 16 June 2026 (primary source)