Private Health Insurance Explained: The Complete Beginner's Guide

If you've never bought private medical insurance (PMI) before, the terminology alone can be a barrier — moratorium, excess, outpatient limit, no-claims discount, FMU. This guide starts from zero and walks through everything you need to understand before comparing quotes, in plain English.

What is private health insurance, actually?

Private medical insurance pays for private treatment of new, acute (treatable, often short-term) medical conditions that develop after your policy starts. You pay a monthly or annual premium, and in return, your insurer covers some or all of the cost of private diagnosis and treatment — typically faster than NHS waiting lists, with more choice over consultant, hospital and timing.

It's important to understand what it's not:

• It is not a replacement for the NHS — it's designed to complement it, mainly for planned, non-emergency treatment
• It does not cover emergencies — that's always 999 or A&E
• It does not generally cover chronic, ongoing condition management (like long-term diabetes or asthma care) — the NHS remains the primary provider for that
• It does not cover pre-existing conditions in the way you might expect — more on this below, because it's the single most misunderstood part of PMI

The big concept: underwriting and pre-existing conditions

When you apply for a policy, the insurer needs to assess risk — essentially, how likely you are to claim. This process is called underwriting, and how it's done determines what you're covered for from day one. There are three main types in the UK market:

Moratorium underwriting (the most common)

You don't fill in a detailed medical questionnaire upfront. Instead, the insurer applies a standard rule: any condition you've had symptoms, treatment, medication or advice for in the 5 years before your policy starts is automatically excluded — but only for a limited time.

If you then go 2 continuous years without any symptoms, treatment or advice for that specific condition, it typically becomes eligible for cover going forward. This is sometimes called a "rolling" moratorium, because if you do seek advice for that condition during the 2-year window, the clock resets and you start the 2 years again from that point.

Why people choose it: it's fast, requires no medical questionnaire, and there's no risk of accidentally forgetting to disclose something on a form. The trade-off is some uncertainty — you won't know for certain whether an old issue is covered until you actually make a claim and the insurer reviews your medical records at that point.

Full Medical Underwriting (FMU)

You complete a detailed health questionnaire when you apply. The insurer reviews it and tells you upfront, in writing, exactly what is and isn't covered — any pre-existing condition might be permanently excluded, or you might be charged a higher premium to include it.

Why people choose it: total clarity from day one. If you have a known condition and want certainty about exactly where you stand rather than the moratorium's "wait and see," FMU removes the ambiguity.

Medical History Disregarded (MHD) and Continued Personal Medical Exclusions (CPME)

MHD is rare and typically only available through employer group schemes — it covers pre-existing conditions with no exclusions at all, usually because the insurer is spreading risk across a large group rather than assessing you individually.

CPME applies specifically when switching insurers. A good new insurer will often honour the same exclusions (and sometimes the same progress toward clearing a moratorium) that applied under your old policy, rather than starting your underwriting clock again from scratch. Always confirm this explicitly with the new insurer before cancelling your existing cover — don't assume it carries over automatically.

The big cost levers: how your premium actually gets set

Four factors do most of the work in determining your price:

1. Age — the single biggest factor; premiums rise as you get older because claims become statistically more likely
2. Postcode — treatment costs more in some regions (London especially) than others, and your premium reflects that
3. Excess — the amount you agree to pay yourself before the insurer covers the rest of a claim. Choosing a higher excess (say £500 instead of £0) typically reduces your premium meaningfully, because you're absorbing more of the small claims yourself
4. Outpatient cover limit — outpatient treatment (consultations, scans, tests before you're admitted to hospital) can be capped at a fixed annual amount (e.g. £500 or £1,000) or left unlimited. Lower limits cost less but mean you pay out of pocket once you exceed the cap

A few other things shift price by smaller but real amounts: your chosen hospital list tier (wider access, especially central London, costs more), whether you smoke, and — with some insurers — wellness/lifestyle factors.

Key terms you'll see on every quote

• Inpatient treatment — when you're admitted to hospital and stay overnight
• Day-patient treatment — admitted for a procedure but don't stay overnight
• No-claims discount (NCD) — a discount that builds the longer you go without claiming, similar in concept to car insurance. Some insurers track this per person on a family policy; others pool it across everyone, which matters because one person's claim can affect the whole family's renewal price under a pooled structure
• Guided / Expert Select pathways — some insurers offer a discount if you accept a curated shortlist of specialists/hospitals rather than completely open choice
• Moratorium period — see above; most commonly 5 years look-back, 2 years to qualify, though some insurers (e.g. AXA Health) offer a shorter 3-year look-back

What's typically included vs typically optional

Across most UK insurers, you'll generally find:

Usually included in a comprehensive policy:

• Cancer cover (diagnostics, surgery, chemotherapy, radiotherapy)
• Inpatient and day-patient treatment
• A baseline level of mental health support (though scope varies significantly — some include it fully, others only as inpatient cover)

Usually optional add-ons, varying by insurer:

• Dental and optical cashback
• Extended outpatient cover beyond the core limit
• Complementary therapies (physiotherapy, osteopathy)
• Travel insurance bundled with your health policy

This is exactly why two "comprehensive" policies from different insurers can look similar on price but cover quite different things — always check what's standard versus what you'd need to add.

How to actually compare policies (a simple process)

1. Decide your underwriting preference — moratorium for speed and simplicity, FMU if you have a known condition and want certainty
2. Set your hospital list requirement — do you need central London access, or is a regional list fine?
3. Pick an outpatient limit that matches how you expect to use the policy — if you rarely see specialists, a lower limit saves money; if you expect ongoing scans or consultations, a higher or unlimited limit avoids surprise costs
4. Choose an excess level you could comfortably afford if you needed to claim tomorrow
5. Check what's included vs optional for cancer, mental health, and therapies specifically — these vary the most between insurers
6. Compare like-for-like quotes, not just headline prices — the cheapest quote with a £1,000 excess isn't comparable to a pricier one with £0 excess

Common mistakes to avoid

• Assuming mental health or therapies are included when they might be a paid add-on with that specific insurer
• Switching insurers without checking CPME — you could unknowingly restart a moratorium clock on a condition that was already covered under your old policy
• Comparing prices without matching the policy structure — different excess and outpatient limits make "cheaper" misleading unless everything else is equal
• Assuming the underwriting method affects your initial premium — generally, it doesn't; moratorium vs FMU affects what's covered, not what you pay upfront
• Not asking about renewal pricing philosophy — some insurers price renewals based on pooled, industry-wide medical inflation; others price more individually based on your own claims, and a few (like Vitality) link it to wellness engagement. This affects your long-term cost more than the entry price does

Ready to compare real policies?

Now that you know what the terms mean, use our comparison tool to see indicative pricing across the UK's leading insurers, filtered by the benefits that actually matter to you. You can also read our specific insurer-vs-insurer comparisons and individual plan reviews for a deeper look at exactly what each policy includes.

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This guide is for general educational information only and does not constitute financial, medical or insurance advice. Underwriting rules, moratorium periods and policy terms can vary and change between insurers and policy years — always confirm current terms directly with the insurer or a regulated broker before purchasing, and read your policy documents carefully.