Treatment-only (inpatient and day-patient) policies cover the expensive part — surgery, hospital admission, and usually cancer treatment — but little or no outpatient care. Premiums typically run 20–30% below comparable full-outpatient cover. The catch is the diagnosis gap: consultations (£150–£300) and scans (MRI £300–£500) are yours to fund or route through the NHS before the policy takes over.
- ✓Treatment-only cover typically costs 20–30% less than comparable full-outpatient policies.
- ✓The diagnosis gap: you fund consultations and scans yourself, or wait for them on the NHS.
- ✓It insures the five-figure risk (surgery, cancer care) and leaves you the three-figure costs.
What treatment-only cover is
A full private medical insurance policy covers the whole pathway: outpatient consultations and diagnostics, then day-patient or inpatient treatment, then aftercare. A treatment-only policy — insurers variously call it inpatient-only, inpatient and day-patient cover, or simply the no-outpatient option — deletes or caps the first stage. Once you need to be admitted for treatment, cover is comprehensive: surgery, the hospital stay, in most cases cancer treatment, and eligible aftercare. Getting to that point is your own affair.
The logic is sound insurance thinking: outpatient care is the predictable, affordable part (consultations at £150–£300, an MRI at £300–£500), while admission is where bills reach four and five figures — a hernia repair at £2,500–£4,500, a hip replacement at £12,000–£15,500. Treatment-only cover insures the ruinous and leaves you the manageable, which is what insurance is classically for. The complication, as ever, is the seam between the two.
Definitions matter at that seam, so pin them down when comparing. Inpatient means admitted with an overnight stay; day-patient means admitted to a bed but home the same day — most modern surgery, from cataracts to hernias, is day-patient work, so a plan covering both is the meaningful minimum. Some plans also fund a limited slice of outpatient care when it's directly tied to an admitted claim, such as a pre-operative assessment or post-surgical follow-up. Where exactly cover switches on differs by insurer, and it's the first thing to check in the wording.
The diagnosis gap — the honest warning
Here's the seam. Before anyone operates on you, somebody must diagnose you — and diagnosis is exactly what a treatment-only policy doesn't fund. Between your GP visit and the operating theatre sit a consultant appointment, possibly imaging, sometimes an endoscopy or biopsy. On this policy type, that stretch is the diagnosis gap, and you cross it one of two ways.
- Self-fund it. Pay for the consultation and scans yourself — often £500–£1,000 all in for a straightforward pathway, more if endoscopy is involved (a private colonoscopy runs £1,800–£2,800). Fast, and the policy picks up everything from admission.
- Use the NHS for it. Free — but you queue. Around 1 in 4 patients waits 6+ weeks for NHS diagnostics (DM01, Jan 2026), and the consultant appointment before that has its own wait. The policy's speed advantage only begins once diagnosis is done.
The price advantage
Outpatient cover is one of the biggest levers in any premium, so removing it cuts deep: treatment-only policies typically cost around 20–30% less than comparable cover with full outpatient benefits, varying by insurer and age. Against the UK average of about £80 a month, that's roughly £16–£24 a month saved — £190–£290 a year, compounding as premiums rise with age.
| Cover level | Indicative monthly premium* | Who funds diagnosis? |
|---|---|---|
| Full outpatient cover | ~£95–£105 | Insurer, from first consultation |
| Capped outpatient (e.g. £500–£1,000/yr) | ~£80–£90 | Insurer up to the cap, then you |
| Treatment-only (no outpatient) | ~£65–£75 | You, or the NHS — cover starts at admission |
*Illustrative figures for a middle-aged adult; real quotes vary by age, region and insurer. Note the middle row: a capped outpatient option often costs only a little more than treatment-only while funding most of a typical diagnostic pathway — for many buyers it's the smarter compromise, covered in our outpatient limits guide.
Price the gap before you buy it
Who treatment-only cover genuinely suits
The product rewards people who go in with a strategy rather than a hope. The classic play: NHS diagnosis, private treatment. You use your GP and NHS diagnostics — accepting those queues — and once a surgical diagnosis lands, the policy funds prompt private surgery, skipping the long treatment waits where the NHS backlog really bites (T&O median 14.1 weeks; 1 in 12 waiting 41.8+ weeks). The 2–6 week private surgery timeline is preserved exactly where waits are longest.
It suits three profiles particularly well: budget-driven buyers who would otherwise drop cover entirely — a 20–30% saving can be the difference between insured and not; people comfortable self-funding small bills, who'd happily pay £250 for a quick consultation but want the £14,000 knee insured; and catastrophe-first thinkers who see insurance as protection against ruin, not a healthcare subscription. It suits badly anyone who wants the policy to make private healthcare feel frictionless — that's precisely what was traded away.
Treatment-only vs the six-week option
Both are respected premium-cutters, and they cut from opposite ends. Treatment-only removes a type of cover: outpatient diagnostics are never funded, but treatment is private the moment you need admission. The six-week option keeps cover types intact but adds a trigger: the policy pays for inpatient treatment only if the NHS can't deliver it within six weeks — which, with most surgical medians at 10–16 weeks, still means most claims go private. It typically saves around 20%; outpatient cover, where included, is usually unaffected.
So the choice reduces to which gap you'd rather own. Six-week option: fast private diagnostics, but a small chance treatment stays NHS if the queue is short. Treatment-only: guaranteed private treatment, but diagnosis is on you. They can even be combined for the deepest discounts — at which point you should be honest that you've built a catastrophe policy, not a convenience one. Our six-week option guide covers the other half; cutting costs ranks all the levers.
Frequently asked questions
What is treatment-only health insurance?
A policy covering inpatient and day-patient care — surgery, hospital admission and usually cancer treatment — with little or no outpatient benefit. Consultations, scans and tests before admission aren't funded: you pay for them yourself or use the NHS. In exchange, premiums typically run 20–30% below comparable full-outpatient cover. Insurers label it variously: inpatient-only, inpatient and day-patient, or the no-outpatient option.
How much cheaper is treatment-only health insurance?
Typically around 20–30% less than comparable cover with full outpatient benefits, because outpatient care is one of the biggest premium drivers. Against the UK average adult premium of about £80 a month, that's roughly £16–£24 a month. Check the middle path too: capped outpatient cover (£500–£1,000 a year) often costs only slightly more than treatment-only while funding most of a diagnostic pathway.
What is the diagnosis gap on inpatient-only health insurance?
The stretch between feeling unwell and being admitted — consultant appointments (£150–£300), imaging (MRI £300–£500), sometimes endoscopy — which a treatment-only policy doesn't fund. You either self-pay it, typically £500–£1,000 for a straightforward pathway, or use the NHS and queue: around 1 in 4 waits 6+ weeks for NHS diagnostics. Cover takes over once treatment requiring admission is diagnosed.
Does treatment-only health insurance cover cancer?
Usually the treatment side, yes — most insurers' inpatient-only plans include their cancer benefit, covering chemotherapy, radiotherapy and cancer surgery. But the diagnostic pathway to the cancer diagnosis — clinics, scans, biopsies — sits in the gap you fund or take through the NHS. Cancer terms differ meaningfully between insurers regardless of plan type, so read the cancer section specifically before choosing this structure.
Can I use the NHS for diagnosis and then claim private treatment?
Yes — that's the textbook strategy for this policy type. Get diagnosed through your GP and NHS diagnostics, then have the policy fund prompt private surgery, typically within 2–6 weeks of the decision to operate. You accept NHS queues at the diagnostic stage and skip them at the treatment stage, where waits are longest — orthopaedics' 1-in-12 figure is 41.8+ weeks. An NHS diagnosis is fully valid for private treatment.
Who is treatment-only health insurance best for?
Three profiles: buyers for whom the 20–30% saving decides whether they hold cover at all; people comfortable paying occasional £150–£500 bills who want the five-figure surgery risk insured; and catastrophe-first thinkers who want protection against ruin rather than frictionless healthcare. It fits badly if you'd want every consultation covered or would hesitate to spend on diagnosis when unwell.
What's the difference between treatment-only cover and the six-week option?
They cut the premium from opposite ends. Treatment-only removes outpatient cover entirely — diagnosis is yours, treatment is always private. The six-week option keeps the cover types but only pays for inpatient treatment if the NHS can't provide it within six weeks — in practice most claims still go private, since surgical medians run 10–16 weeks. Roughly similar savings; the choice is which gap you'd rather own.
Will a treatment-only policy pay for my consultant appointment before surgery?
Generally no — pre-admission consultations and diagnostics are the definition of what this plan type excludes, though a few insurers include limited pre-operative or post-operative outpatient care linked directly to an admitted claim. Check the wording for exactly where cover switches on. Budget for £150–£300 per consultation plus imaging, and always pre-authorise the treatment itself before admission.
Do all insurers offer a treatment-only or inpatient-only option?
Most major UK insurers offer either a no-outpatient plan or let you set outpatient cover to zero when building a policy — though names and exact boundaries differ, and a few budget products are inpatient-led by design. Because the switch-on point (what counts as day-patient, what pre-admission care is included) varies, compare wordings rather than labels — or let a broker map the market's versions against your budget.