Scottish Provident paid out 91% of all CI claims in the first half of 2013, according to figures released today.
The insurer has revealed £53 million was paid out to policyholders in the first half of the year.
Just 2% of claims were declined on the grounds of non-disclosure, the figures said.
The average pay out was £90,478, with the maximum claim exceeding £600,000.
Cancer remains the most claimed for illness (66%), followed by heart attack (12%) and stroke (6%).
Breast cancer accounts for almost a third (31%) of all cancer claims made over the first six months of the year.
Ian Smart, head of product development and technical support at Scottish Provident said: "Suffering a critical illness can be distressing enough, without compounding this with financial concerns about how to cope with the loss of a regular income.
"We are committed to paying out as many CI claims as possible; swift financial support can make all the difference to both a claimant and their family."
