With NHS waiting lists running into the millions, more people are looking at private medical insurance as a way to be seen and treated faster. But it is widely misunderstood, and it is not a replacement for the NHS. This guide explains what private medical insurance is, how it works, what it covers, and who it is for.

What private medical insurance is

Private medical insurance, often shortened to PMI or called private health insurance, is a policy that pays for private medical treatment. In return for a premium, the insurer covers the cost of treatment for certain conditions at private hospitals, giving you faster access, a choice of consultant and hospital, and usually a private room. It sits alongside the NHS rather than replacing it, and is mainly aimed at planned treatment for conditions that arise after you take out the cover.

How it works

You pay a monthly or annual premium, and when you need treatment for a covered condition, you claim. Typically you would see your GP, who refers you, and then your insurer arranges or approves private treatment at a hospital on their list. You usually pay any excess you have chosen, and the insurer pays the rest, up to the limits of your policy. The exact process and what is covered depend on the level of cover you buy.

Acute conditions, not chronic ones

A crucial point is that PMI is designed to cover acute conditions: new health problems that respond to treatment and can be cured or brought under control, such as a hip needing replacement or a cataract needing surgery. It is generally not designed to cover chronic conditions, which are long-term and need ongoing management, such as diabetes or asthma. Understanding this distinction is the key to understanding what PMI will and will not pay for, as our guide to what it does not cover explains.

What it typically covers

A typical policy covers the cost of private treatment as an inpatient, where you stay in hospital overnight, and as a day patient. This includes things like surgery, hospital accommodation, nursing and specialist fees. Depending on the level of cover, it may also include outpatient treatment, such as consultations, diagnostic tests and scans that do not require a hospital stay. More comprehensive policies add extras like mental health cover and therapies, as our guide to levels of cover describes.

The levels of cover

Private medical insurance is not one-size-fits-all. At the basic end, policies cover inpatient and day-patient treatment only, which keeps the price down. More comprehensive policies add outpatient cover, mental health support, and additional therapies. You can often tailor a policy by adding or removing these elements, and by choosing your excess and hospital list. This flexibility means the cost varies widely, so it is worth understanding the options before deciding what you actually need.

It works alongside the NHS

Private medical insurance does not take you out of the NHS. You remain entitled to NHS care, and in an emergency the NHS is where you would be treated. PMI is for planned, private treatment of acute conditions, giving you speed and choice for those, while the NHS remains your safety net for emergencies, chronic conditions and much more. The two work together, as our guide to how PMI works alongside the NHS explains.

Why people buy it

The main reason people take out PMI is speed. With the NHS waiting list in England at around seven million, people value being able to see a specialist and start treatment quickly, rather than waiting months. Others value the choice of consultant and hospital, the comfort of a private room, and quicker diagnosis. For many, the peace of mind that they could be treated promptly if something went wrong is the main appeal.

What affects the cost

Your premium depends on several factors: your age, where you live, your health and medical history, the level of cover you choose, and your excess. Older people pay more, because they are more likely to claim, and premiums tend to rise each year. The hospitals you are willing to use and the optional extras you add also affect the price, which is why two policies can cost very different amounts, as our guide to why premiums rise covers.

How your medical history is handled

When you join, the insurer needs to know how to treat your medical history, and there are two main approaches: moratorium underwriting, where you answer no medical questions upfront but recent pre-existing conditions are excluded, and full medical underwriting, where you disclose your history and the insurer tells you exactly what is covered. Each has pros and cons, as our guide to moratorium versus full medical underwriting explains in detail.

What it does not do

It is just as important to know what PMI is not. It does not replace the NHS, does not usually cover emergencies, chronic conditions, routine pregnancy or GP services, and generally excludes pre-existing conditions. It is a way to get faster, private treatment for new, acute problems, not a substitute for the health service. Being clear about this avoids disappointment and helps you judge whether it is worth it for you.

Where you can be treated

With private medical insurance, treatment takes place at private hospitals or private wings of NHS hospitals, chosen from your insurer's hospital list. The breadth of that list depends on your policy: more expensive policies give access to a wider range of hospitals, including prestigious central ones, while cheaper policies restrict you to a defined network. Part of the appeal of going private is the choice of where and by whom you are treated, often with a private room, which is something the list determines.

It is not the same as a health cash plan

Private medical insurance is sometimes confused with a health cash plan, but they are very different products. PMI pays for private treatment of acute conditions, potentially running to large sums. A health cash plan, by contrast, is a cheaper product that pays modest amounts towards everyday health costs like dental check-ups, eye tests and physiotherapy. They serve different purposes, and some people hold a cash plan instead of, or alongside, full PMI, depending on what they want to cover.

In short

Private medical insurance pays for private treatment of acute, treatable conditions, giving faster access, choice of consultant and hospital, and usually a private room. It works alongside the NHS, not instead of it, and does not cover emergencies, chronic conditions or, usually, pre-existing ones. Cover ranges from basic inpatient policies to comprehensive plans with outpatient and mental health cover, with the price shaped by your age, health and the cover you choose.

Where to get help and next steps

Weigh it up with our guide to is private health insurance worth it, understand the boundaries in what it does not cover, and see how it works alongside the NHS. This is general information, not medical or financial advice.