Your existing policy keeps covering an acute condition it already accepted, but a chronic condition is excluded, and switching insurer gets harder once you are diagnosed.

What actually happens

A new diagnosis does not let your current insurer cancel or single you out at renewal. If the condition is acute and the policy covered it when it arose, that cover continues — insurers cannot retrospectively exclude something they were already paying for. What a renewal can do is raise the overall premium, but that is the usual mix of age, inflation and pooled claims rather than a penalty aimed at you.

The important line is acute versus chronic. Private medical insurance covers acute conditions — those expected to respond to treatment and resolve — but every insurer excludes the ongoing management of chronic conditions. So a diagnosis that becomes long-term care will reach the point where the policy stops funding it, and understanding where that line falls for your condition matters more than the renewal price.

A diagnosis also changes your switching position. Move to a new insurer as a fresh applicant and the condition will be declared and excluded, or parked under a moratorium. The way to keep it recognised is continued personal medical exclusions, which carries your existing terms across — but that protects the position you already have, it does not turn a newly excluded condition into a covered one.

The practical step is to stay put unless you have confirmed a switch keeps the diagnosis covered. Ask your insurer how the condition is classified and what it will and will not fund going forward, and take advice before moving, because switching at the wrong moment can lock in an exclusion you would otherwise avoid.

Questions to put to the insurer or broker

  • Is my condition being treated as acute or chronic under the policy?
  • What ongoing treatment will the policy fund, and where does it stop?
  • If I switch on continued exclusions, does this diagnosis stay covered?

Related questions

What a switch cannot change

Switching insurer or adjusting cover changes the price, not your medical history. A condition you already have stays excluded when you move — carried across as it stands on continued personal medical exclusions, re-declared under full medical underwriting, or parked under a fresh moratorium. Chronic conditions are excluded by every insurer whose wording we hold, and renewal terms change each year, so read the document you are actually offered before you commit.

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