Many UK health insurers use a no-claims discount (NCD) scale with discounts positioned at up to around 65–70% off the base rate at the top tiers. Claim-free years move you up; claims move you down — often by two or three tiers at once — raising your renewal. It's why small claims can cost more than they pay out, and why the NCD system rewards using cover for what matters.
- ✓NCD scales position top-tier discounts at up to around 65–70% off insurers' base rates.
- ✓One claim typically drops you two or three tiers, raising renewals for several years.
- ✓Small claims close to the excess can cost more in lost discount than they pay out.
How health insurance NCD actually works
Not every insurer uses one, but many — Aviva and AXA Health prominently among them — price personal policies on a no-claims discount scale. You join at a given tier (often a high one, which is part of why new-customer quotes look attractive), each claim-free year nudges you up towards the maximum, and claims move you down. Your renewal premium is the insurer's base rate for your age and cover, minus your current tier's discount.
The scales are long — commonly 10 to 15 levels — with maximum discounts positioned at up to around 65–70% off base rates. That framing matters: the base rate is set by the insurer, so the discount is best read as a pricing mechanism rather than a saving off anything you'd otherwise pay. What's real is the movement: where you sit on the scale this year versus last visibly changes your premium.
What happens when you claim
Claim, and at renewal you drop down the scale — typically by more tiers than a claim-free year climbs. The exact mechanics vary by insurer, but a common shape looks like this:
| Scenario | Typical NCD effect | Renewal impact |
|---|---|---|
| Claim-free year | Up 1 tier | Small premium improvement (before medical inflation) |
| One modest claim | Down 2–3 tiers | Renewal often rises 10–25% beyond normal inflation |
| Multiple claims in a year | Down 3+ tiers (varies) | Larger rise; several claim-free years to recover |
| Claim on a protected-NCD policy | No movement (within limits) | Renewal rises only with age and medical inflation |
Two features soften the blow at some insurers: many don't penalise claims below a threshold or those covered entirely by your excess, and some cap how far you can fall in one year. Others move you regardless of claim size — a £300 physio claim and a £13,000 knee replacement can cost the same three tiers. Reading the NCD rules is as important as reading the benefit table.
Protected NCD: paying to stand still
Several insurers offer NCD protection as a paid option: for a supplement — typically a few percent of premium — your discount tier doesn't move when you claim, usually within limits such as one or two claims per year or a cap on claim value. It converts the scariest part of claiming (the multi-year renewal penalty) into a known, small annual cost.
- When it earns its keep. If you expect to use the policy — ongoing physio needs, children on the policy, or you simply want to claim without renewal anxiety — protection usually pays for itself with a single protected claim.
- When to skip it. If you hold insurance purely for rare, major events, you're paying every year to protect against a penalty you'll seldom trigger — and a major claim is worth taking the tier hit for anyway.
- Check the limits. Protection often covers a set number of claims or a monetary cap; a heavy claims year can still move you down.
- It protects the tier, not the base rate. Premiums still rise with age and medical inflation — protection only removes the claims-related component.
Compare insurers with and without NCD
The uncomfortable truth about small claims
Here's the honest maths the NCD system creates. Suppose your premium is £80/month, a claim drops you three tiers, and that raises renewals by roughly £15/month for three years while you climb back: the claim's hidden cost is around £540. If the treatment was a £400 course of physio and you carry a £250 excess, claiming recovered £150 — and cost you £540 in future premiums. Self-paying would have left you £390 better off.
Run that logic before every small claim on an NCD policy: amount the insurer will actually pay (after excess) versus your insurer's tier penalty spread over the recovery years. Small outpatient claims near the excess often fail the test; anything inpatient, diagnostic-to-surgical, or open-ended — where costs could escalate — passes easily. And never let NCD maths delay a referral for something potentially serious: an unclear diagnosis is exactly what the policy is for, and cancer pathways in particular can run to tens of thousands.
NCD and switching insurers
Your NCD position doesn't formally transfer between health insurers the way car insurance proof does — each insurer places you on its own scale using its own rules, informed by the claims history you declare. In practice, switchers with clean recent records are usually placed at or near attractive tiers (that competitive first quote again), while a recent claims history follows you onto the new scale through your disclosure.
This creates a genuine renewal strategy: if a claim has knocked you down your insurer's scale, compare the market. A new insurer prices you on your declared history, not your old insurer's tier arithmetic, and switching on CPME terms preserves your underwriting position while resetting the pricing. Just declare claims history accurately — it's a material fact — and remember that not all insurers use NCD at all: WPA and others price without a published scale, which some people prefer precisely because claiming doesn't carry a formal tier penalty. Our renewal guide covers the wider negotiation.
Frequently asked questions
How big are no-claims discounts on health insurance?
Insurers that use NCD scales position maximum discounts at up to around 65–70% off their base rates, across scales of typically 10–15 tiers. New customers often start high on the scale — part of why first-year quotes look keen. The base rate is the insurer's own, so treat the percentage as a pricing mechanism, not a literal saving.
Does claiming on health insurance increase my premium?
On NCD-based policies, generally yes — a claim typically moves you down two or three discount tiers at renewal, often adding 10–25% beyond normal inflation, and the elevated price persists while you climb back. On policies without an NCD scale, your own claim doesn't directly re-price you, though pool-wide claims inflation still applies.
How many tiers do I drop on my health insurance NCD if I claim?
Commonly two or three for a single claim year, though rules vary: some insurers ignore claims below a threshold or fully absorbed by your excess, some cap the annual fall, and others apply the same drop regardless of claim size. The NCD rules section of your policy sets it out precisely — read it before claiming.
Is protected no-claims discount worth it on health insurance?
It's worth it if you realistically expect claims — families, ongoing physio, or anyone who wants to claim without renewal anxiety — since one protected claim usually repays the few-percent supplement. If you hold cover purely for rare major events, skip it: you'd pay annually to avoid a penalty you rarely trigger.
Should I avoid claiming on health insurance to protect my no-claims discount?
For small claims barely above your excess, self-paying often wins: a claim that recovers £150 can cost £500+ in lost discount over the recovery years. But never sit on potentially serious symptoms to protect a discount — uncertain diagnoses and anything that could escalate are exactly when claiming is unambiguously right.
Do all health insurers use no-claims discounts?
No. Aviva and AXA Health are prominent users of NCD scales on personal policies; others, such as WPA, price without a published scale, and Vitality runs status-based pricing tied to engagement instead. If the idea of being re-priced for claiming bothers you, structure your comparison around insurers that don't use claims-linked tiers.
Does my health insurance no-claims discount transfer if I switch insurer?
Not formally — there's no portable NCD certificate as with car insurance. The new insurer places you on its own scale based on the claims history you declare. Clean recent records typically land attractive tiers; recent claims follow you via disclosure. Switching after a tier drop is often worthwhile — compare on CPME terms.
Do claims paid entirely by my excess affect my no-claims discount?
At some insurers, no — claims fully absorbed by your excess, or below a set threshold, don't move your tier. At others, any registered claim counts. This detail changes the maths of small claims significantly, so check your insurer's NCD rules before deciding whether to put a borderline claim through.
Why did my health insurance renewal jump after one small claim?
You likely dropped several NCD tiers — insurers often apply the same tier penalty to small claims as large ones, and the drop compounds with age pricing and medical inflation. Ask your insurer to break down the increase, then compare the market: a new insurer prices your history on its own scale, which can be kinder.