Private Health Insurance vs Health Cash Plan: What's the Difference? (UK 2026)
Last updated: September 2026
Private Health Insurance vs Health Cash Plan: What's the Difference?
Private medical insurance (PMI) and health cash plans can both help you pay for private healthcare, but they are different products that cover different things. Treating one as a cheaper version of the other can leave gaps in your cover. This guide explains what each one does.
What private medical insurance covers
PMI covers the cost of private treatment for new, acute medical conditions, including hospital procedures, specialist consultations, diagnostic tests and cancer treatment. Depending on the policy, it may also cover mental health support. You pay a monthly premium; when you need treatment, the insurer pays the private hospital and specialist directly or reimburses you.
PMI can help protect you from unpredictable, expensive events, such as private cancer treatment, inpatient surgery, MRI scans and specialist consultations when NHS waits are long. You may never need this cover, but the cost of treatment without it could be significant.
Typical cost: £28–£200+/month depending on age, cover level and insurer.
What a health cash plan covers
A cash plan reimburses part of routine healthcare costs you have already paid, up to an annual limit for each benefit category. It does not pay the provider directly or cover hospital treatment. Instead, you pay for a dental check-up, eye test, physiotherapy session or prescription, then claim back a portion of the cost—often 50–100%, up to the limit—from your cash plan provider.
The aim is to reduce predictable, routine healthcare costs you were likely to incur anyway. Most adults see a dentist and optician regularly. If you use physiotherapy or similar therapies, the reimbursement may also reduce your costs over the year.
Typical cost: £8–£30/month depending on tier and provider.
What each does NOT cover
PMI does not cover:
- Routine dental check-ups or optical tests (usually optional add-ons)
- Pre-existing conditions initially
- Chronic condition management
- Emergency treatment
- Pregnancy
Cash plans do not cover:
- Hospital treatment or surgery
- Cancer treatment
- Pre-existing conditions (usually)
- Emergency treatment
The key difference is that a health cash plan does not protect you against the large, unpredictable medical costs that PMI is designed to cover. If you have a cash plan but not PMI and are diagnosed with cancer, the cash plan's dental and optical reimbursements will not pay for your cancer treatment.
Benenden Health — a third model
Benenden Health is separate from both types of cover. It is a membership scheme, not medically underwritten insurance, and offers discretionary access to private diagnostic tests and treatment when NHS waits exceed a set threshold: three weeks for tests and five weeks for treatment. Access is discretionary, rather than contractually guaranteed like a PMI or cash-plan claim. Benenden does not cover private cancer treatment.
At £15.85 a month, it is the lowest-cost way to access any form of private healthcare. However, it is different from both PMI and a cash plan and should not be confused with either.
Do you need one, both, or neither?
PMI only: The right choice if protecting against large, unpredictable medical costs is the priority and you're comfortable paying dental and optical bills from income. Most PMI buyers don't also hold a cash plan.
Cash plan only: Makes sense if your main concern is routine costs (dental, optical, physio) and you're comfortable using the NHS for any major medical event. Appropriate if PMI is genuinely unaffordable or you've decided the risk is worth taking.
Both: Some people hold both — a cash plan for predictable routine costs, PMI for the unpredictable expensive scenarios. The combination makes financial sense if you use enough routine healthcare that the cash plan pays for itself, and you want the protection of PMI for bigger events.
Neither: This may be a reasonable choice if you are young, healthy and comfortable with NHS waiting times for the foreseeable future. However, an unexpected need for treatment could change the calculation.
Quick guide to which cash plan providers offer what
| Provider | From (per month) | Best for |
|---|---|---|
| Westfield Health | £8.58/mo | Lowest price, free child cover |
| Simplyhealth | ~£10/mo | Highest dental caps |
| Sovereign Healthcare | ~£9/mo | Highest-rated claims service |
| Medicash | ~£9/mo | Broad therapy categories |
| Health Shield | ~£12/mo | Dependent children included |
| Benenden Health | £15.85/mo | NHS-wait backstop, not cash plan |
This guide is for general educational information only and is not financial or insurance advice. Product terms vary — always confirm current cover and exclusions before purchasing.