How does private medical insurance work in the UK?
Summary: Private medical insurance helps pay for eligible private treatment, usually for new acute conditions that arise after cover begins. You pay a premium, follow the policy’s claims process, and may contribute an excess. Cover, exclusions, underwriting, hospital access and claim limits vary, so the policy wording is as important as the headline price.
Many people ask how does private medical insurance work because the answer depends on more than paying a monthly premium. You normally need to understand what the policy covers, whether a referral is required, which hospitals and consultants are included, and how much you may pay yourself. Our guide to what private medical insurance means provides useful background before you compare plans.
Private medical insurance operates alongside the NHS rather than replacing it. In 2024, an estimated 14% of UK adults held private medical insurance, according to the FCA survey. The appeal is usually faster access to eligible planned care, greater choice and more privacy, although policies do not cover every condition or treatment.
What does private medical insurance cover?
Private medical insurance is designed mainly for acute conditions. These are illnesses or injuries that are expected to respond to treatment and improve, rather than conditions requiring lifelong monitoring or ongoing management.
Core cover commonly includes inpatient and day-patient treatment. This may involve hospital accommodation, theatre fees, nursing care, consultant fees and diagnostic tests connected with an approved procedure. Some policies also include cancer treatment, although the exact drugs, therapies, limits and follow-up care depend on the plan.
Outpatient cover is often available as an optional extra or at different benefit levels. It can help pay for consultant consultations, diagnostic scans and tests that do not require a hospital admission. Without suitable outpatient cover, you may need to use the NHS for the initial consultation or diagnosis before private treatment becomes available under the policy.
Other optional benefits can include physiotherapy, mental health support, therapies, dental care, optical care, digital GP appointments and travel cover. These extras may have annual limits, referral requirements or separate terms. You should therefore compare the actual benefits rather than assuming that a comprehensive policy includes every service.
Private medical insurance is different from a healthcare cash plan. A cash plan usually reimburses limited amounts for routine expenses such as dental appointments, optical care or physiotherapy. It generally does not pay for major surgery, private hospital stays or expensive specialist treatment.
How do premiums, excesses and policy limits work?
Your premium is the amount you pay to keep the policy active. It may be paid monthly or annually. Insurers normally consider your age, location, selected benefits, hospital access, underwriting method, policy excess and whether you are buying individual, family or employer-sponsored cover.
The policy excess is the amount you agree to pay towards eligible treatment when you claim. For example, if an approved procedure costs £4,000 and your applicable excess is £500, you may need to contribute £500 while the insurer settles the remaining eligible cost. The exact operation of the excess varies between policies.
Policy choice | How it affects cover | What to check |
|---|---|---|
Higher excess | Can reduce the premium but increases your contribution when you claim | Whether the excess applies per claim, per person or once each policy year |
Restricted hospital list | May reduce the premium while limiting where you can receive treatment | Whether your preferred local hospital and consultants are included |
Outpatient limit | Controls how much the insurer contributes towards consultations and tests | Whether the limit is sufficient for specialist appointments and diagnostic scans |
Six-week option | May direct you to NHS treatment when the NHS waiting time is below the selected period | When private treatment becomes available and which procedures are affected |
Some policies include an annual or lifetime limit for particular benefits. Mental health treatment, therapies, outpatient consultations and certain medicines may have separate financial or session limits. You should also check whether the insurer pays the full consultant fee or only up to an approved fee schedule.
For help comparing the financial and coverage details, you can read our guide to how health insurance policies work. The most useful comparison is not always the cheapest quote. It is the policy that gives you suitable access while leaving you able to afford the excess and any costs outside the insurer’s approved terms.
What is medical underwriting?
Medical underwriting is the process insurers use to assess your medical history and decide how it affects your cover. It helps determine which conditions are excluded, whether special terms apply and, in some cases, how the premium is calculated.
The two common approaches are full medical underwriting and moratorium underwriting. With full medical underwriting, you provide detailed information when you apply. The insurer then confirms specific exclusions before the policy begins, giving you greater certainty about what is covered.
With moratorium underwriting, you usually provide less medical information at the start. The insurer assesses your history when you make a claim. Conditions, symptoms or treatment from a defined period before the policy began may be excluded, although some insurers may reconsider cover after a continuous period without symptoms, advice, medication or treatment.
Underwriting method | Main process | Potential advantage | Important limitation |
|---|---|---|---|
Full medical underwriting | You complete a detailed health questionnaire before cover starts | Exclusions are usually clearer from the beginning | The application may take longer and require more medical detail |
Moratorium underwriting | Relevant medical history is assessed when you claim | The application can be simpler and faster | Claims may require additional medical checks before approval |
Continued personal medical exclusions | Existing underwriting terms may transfer when you switch providers | Can support continuity when changing insurer | Eligibility depends on the existing and new policy terms |
Pre-existing conditions are usually not covered automatically. This can include a diagnosed illness, previous injury, recurring symptom, medical advice, medication or treatment received before the policy started. The insurer’s definition matters, so you should answer application questions fully and accurately.
If you have a complex medical history, a specialist consultation can help you understand the underwriting implications before you apply. Our choosing a private health insurance plan guide can also help you organise the questions to ask about exclusions, switching and policy suitability.
What happens when you make a claim?
A typical claim begins when you develop a new symptom or injury. Many insurers ask you to see a GP first, either through the NHS or an approved private service. The GP may provide a referral describing the type of specialist or investigation you need.
You then contact your insurer before booking treatment. This stage is often called pre-authorisation. The insurer checks whether the condition is covered, whether the proposed treatment is medically necessary, which hospitals and consultants are approved, and whether any limits or excesses apply.
Arrange an initial GP consultation and obtain a referral if required.
Contact the insurer with your policy number, symptoms and referral details.
Confirm authorisation before arranging a consultation, scan or procedure.
Choose an approved consultant and hospital from the available network.
Ask the insurer to authorise any further tests or treatment recommended later.
Pay the applicable excess or other agreed contribution.
Once treatment is approved, the hospital or consultant will often invoice the insurer directly. You may still be responsible for an excess, a benefit shortfall or costs arising from using a provider outside the approved network. Never assume that a referral or appointment is covered until the insurer confirms it.
Moratorium underwriting can sometimes make the authorisation stage slower because the insurer may need evidence about previous symptoms or treatment. Full medical underwriting may provide more certainty, but the policy can contain exclusions that apply from the beginning.
How does private medical insurance work alongside the NHS?
Private medical insurance does not remove your entitlement to NHS care. You can continue to use your NHS GP, NHS urgent care, NHS hospital services and emergency departments. Private insurance gives you an additional route for eligible planned treatment, subject to the policy terms.
Emergency care is generally handled by the NHS. If you have a life-threatening emergency, call 999 or attend A&E. Private medical insurance is usually intended for planned consultations, diagnostics and treatment rather than immediate emergency response.
The relationship between public and private care is visible in the wider UK healthcare market. In the first quarter of 2026, the Private Healthcare Information Network recorded 247,495 private hospital and clinic admissions. Private medical insurance funded 69% of admissions, while self-pay funded 31%, according to its Q1 2026 market update.
These figures describe private admissions, not the proportion of the population with insurance. They also do not mean every insured person will receive faster treatment for every condition. Availability depends on the treatment, hospital capacity, consultant network, policy terms and whether the insurer authorises the claim.
In practice, many people use both systems. You may use the NHS for routine care, chronic condition management and emergencies, while using private insurance for an approved specialist consultation or planned operation.
What is usually excluded from private medical insurance?
Exclusions are one of the most important parts of understanding private medical insurance. Common exclusions include pre-existing conditions, chronic conditions requiring ongoing management, routine pregnancy and childbirth, cosmetic procedures, infertility treatment, experimental treatment and emergency A&E care.
A policy may cover the investigation of symptoms but exclude long-term treatment after a chronic diagnosis. For example, a plan could cover tests for persistent fatigue, but not the ongoing management of a condition that requires regular monitoring and medication.
Pre-existing symptoms can also affect a claim even when you did not have a formal diagnosis. A previous consultation, prescription, referral or recurring symptom may be relevant under the insurer’s definition. Failing to disclose requested information can create problems when you later claim.
Waiting periods may apply after you take out a policy. Some benefits may not be available immediately, and employer schemes can have their own joining rules. Policies also commonly renew every year, allowing the insurer to review the premium and terms at renewal.
The Office for National Statistics recorded voluntary health insurance as 2.8% of total UK healthcare spending in 2025, equivalent to £9.5 billion. The figure includes voluntary health insurance financing across the healthcare system, so it should not be read as an average premium or a measure of individual policy value. It provides context for the scale of private cover in the UK through the UK Health Accounts.
How should you compare private medical insurance?
Start with the care you want the policy to fund. If your priority is access to planned surgery, inpatient and day-patient cover may be central. If you want faster diagnosis, check the outpatient benefit, diagnostic limits and referral process.
Review inpatient, day-patient and outpatient cover separately.
Check the insurer’s definition of acute, chronic and pre-existing conditions.
Compare the underwriting method and the certainty it provides.
Confirm the hospital list and consultant network in your area.
Check the excess, benefit limits and fee arrangements.
Read exclusions, waiting periods and renewal conditions.
Location can influence the price and practical value of a policy. A broad national hospital list may cost more than a restricted local list. It is sensible to check whether the hospitals you would realistically use are included before paying for wider access.
Families should check how children are defined, whether everyone must live at the same address and whether family discounts apply. Employers should examine the scheme’s eligibility rules, tax treatment and what happens when an employee leaves.
For people with pre-existing symptoms or complicated requirements, direct online comparison may not answer every underwriting question. We provide a free AI health assessment and free intermediary consultation pathway for UK residents. The assessment produces a clinical symptom summary for discussion with a doctor or private consultant, while the final insurance advice and product choice remain with the FCA-regulated provider.
Our service can also connect small businesses with regional specialists for group healthcare configuration. A client statement from Maidstone describes help arranging group healthcare and corporate premiums, but this is an individual example, not a general saving or eligibility guarantee.
Understanding private medical insurance before you buy
How private medical insurance works depends on the interaction between cover, underwriting, exclusions, authorisation and provider networks. It can help fund eligible private treatment for new acute conditions, but it is not designed to replace the NHS or cover every medical need.
Before choosing a policy, compare the practical details rather than relying on the premium alone. Confirm what happens when you claim, how the excess applies, which hospitals are available and how your medical history affects cover. Read the Insurance Product Information Document and full policy terms before making a decision.
Get help comparing private medical insurance
Choosing cover can feel difficult when you are balancing exclusions, underwriting, hospital access and cost. If you want help organising your questions before speaking with an insurer, our UK service combines health information support with access to specialist insurance consultations.
You can use our free AI assessment to create a clinical symptom summary for discussion with a healthcare professional, then request a free intermediary consultation through our private medical insurance pathway. The regulated provider remains responsible for the final advice and product choice.
Frequently Asked Questions
Does private medical insurance replace the NHS?
No. Private medical insurance works alongside the NHS and is generally used for eligible planned consultations, diagnostics and treatment. NHS services remain available for routine care, chronic condition management and emergencies.
Are pre-existing conditions covered by private medical insurance?
Usually, pre-existing conditions are excluded or covered only under specific terms. The result depends on the insurer, your medical history and the underwriting method, so you should disclose information accurately and check the exclusions before buying.
Do I need a GP referral to claim?
Many policies require a GP referral before they will authorise specialist treatment or diagnostic tests. Some insurers provide direct access to particular services, but you should follow the process in your policy and obtain approval before treatment.
What does an excess mean on a health insurance policy?
An excess is the amount you contribute towards eligible treatment when you claim. A higher excess may reduce your premium, but you should confirm whether it applies per claim, per person or once during each policy year.
Can AI help me explore private medical insurance?
AI can help organise symptoms and questions, but it is not a diagnosis, treatment or insurance decision. Our free AI assessment creates a clinical symptom summary for discussion with a doctor or private consultant, followed by access to an intermediary consultation pathway for UK residents.
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