Private Health Insurance Explained: The Complete Beginner's Guide (UK, 2026)

Private Health Insurance Explained: The Complete Beginner's Guide

If you have never bought private medical insurance (PMI), the terminology alone can be a barrier: moratorium, excess, outpatient limit, no-claims discount and full medical underwriting (FMU). This beginner's guide explains the key terms and what to understand before comparing quotes.

What is private health insurance, actually?

Private medical insurance pays towards private treatment for new, acute (treatable and often short-term) medical conditions that develop after your policy starts. You pay a monthly or annual premium, and your insurer covers some or all of the cost of eligible private diagnosis and treatment. This may give you faster access than an NHS waiting list and more choice over your consultant, hospital and appointment time.

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

• It is not a replacement for the NHS. It is designed to complement the NHS, mainly for planned, non-emergency treatment.
• It does not cover emergencies. Call 999 or go to A&E.
• It does not usually cover ongoing management of chronic conditions, such as long-term diabetes or asthma care. The NHS remains the main provider for this.
• It does not usually cover pre-existing conditions in the way you might expect. The section below explains this in more detail.

The big concept: underwriting and pre-existing conditions

When you apply for a policy, the insurer assesses risk, including how likely you are to claim. This process is called underwriting. The underwriting approach affects what is covered from the start of your policy. You may also come across these related terms:

Moratorium underwriting (the most common)

You may not need to complete a detailed medical questionnaire upfront, but the insurer still applies the rules in your policy. There is no universal five-year look-back or two-year clearance rule: the period before cover starts and the test for reconsidering an exclusion depend on the product and underwriting option.

For example, WPA Complete Health's Moratorium guidance says its look-back is five years before joining and that a pre-existing condition may be covered after two continuous years from membership start without symptoms, treatment, medication or advice. Saga's online Moratorium option instead describes a three-year look-back and a separate two-consecutive-year period after cover starts. Meeting a time period does not guarantee cover; check the full wording and ask the insurer how it applies to a specific condition.

Why people choose it: the application may be simpler than full medical underwriting. The trade-off is uncertainty: the insurer may need to review your medical records when you claim to decide whether a condition is covered. Answer all application questions accurately.

Full Medical Underwriting (FMU)

You complete a detailed health questionnaire when you apply. The insurer reviews it and sets out in writing what is and is not covered. A pre-existing condition may be excluded permanently, or the insurer may charge a higher premium to include it.

Why people choose it: an upfront written decision about disclosed medical history. If you have a known condition and want to know how it will be treated, FMU can give you more certainty than a moratorium approach, although exclusions may still apply.

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

MHD is rare and is typically available only through employer group schemes. It covers pre-existing conditions without exclusions, usually because the insurer spreads risk across a large group rather than assessing each person individually.

CPME applies when you switch insurers. A new insurer may agree to carry forward exclusions or an existing moratorium start date, but acceptance and the terms transferred depend on the insurer and your application. Before cancelling existing cover, confirm in writing what will carry over.

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, such as £500 instead of £0, typically reduces your premium because you pay more of the smaller 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

Other factors can also affect the price, including your hospital-list tier (wider access, especially in central London, costs more), whether you smoke and, with some insurers, wellness or 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 not required to 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 or Expert Select pathways — some insurers offer a discount if you agree to choose from a shortlist of specialists or hospitals rather than having completely open choice
• Moratorium look-back — commonly five years, but it depends on the product. For example, AXA's Personal Health handbook specifies five years for moratorium terms, while its separate AXA Health Plan FAQ describes three years. Check the named product and certificate rather than applying one insurer-wide figure.

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 why two “comprehensive” policies from different insurers can have similar prices but cover different things. Always check which benefits are standard and which you would need to add.

How to actually compare policies (a simple process)

1. Decide which underwriting approach you prefer: moratorium for a potentially simpler application, or FMU if you have a known condition and want an upfront written decision
2. Decide what hospital access you need: do you need access to hospitals in central London, or would a regional list suit you?
3. Choose an outpatient limit that matches how you expect to use the policy. A lower limit may save money if you rarely see specialists; a higher or unlimited limit may help avoid unexpected costs if you expect to need scans or consultations.
4. Choose an excess that you could comfortably afford if you needed to claim.
5. Check which cancer, mental health and therapy benefits are included or optional, as these vary considerably between insurers.
6. Compare like-for-like quotes, not just headline prices. A quote with a £1,000 excess is not directly comparable with one that has a £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 compare indicative prices from leading UK insurers, filtered by the benefits that matter to you. You can also read our insurer comparisons and individual plan reviews to find out more about what each policy includes.

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