Bright Grey, part of the Royal London Group has upgraded its critical illness cover (CI), alongside incorporating the ABI's statement of best practice for CI.
Spinal stroke has been added to the list of full payment definitions and the Parkinson's disease definition has been upgraded to ABI+.
The definition for multiple sclerosis has been simplified and the additional conditions for breast and prostate cancers have been enhanced.
The maximum payment available under the severity definitions from Bright Grey has increased to £25,000 or 25% of the sum assured, whichever is the lower.
Changes have also been made to full payment and severity definitions including cancer, heart attack and children's critical illness cover.
CIExpert branded the changes to Bright Grey's CI offering as "uniformly positive".
A fall in new protection business in 2014 led to the CEO of Royal London calling Bright Grey and Scottish Provident's propositions "tired".
Debbie Kennedy, head of protection proposition design for Royal London, said: "We've continued to focus on making changes which affect our most claimed for conditions; to make improvements that result in more claims paid and faster payments to customers.
"It's also important for us to improve clarity in our definitions, to supplement the ABI Statement of Best Practice.
"During 2014, Bright Grey's protection proposition was significantly developed, to enhance services for advisers and their clients.
"These latest developments are the latest improvements to its critical illness cover proposition".