British Friendly Society has become the second insurer to add its name to COVER's campaign to reform the assessment of claims for income protection (IP).
The campaign aims to end the practice of writing list-based occupational definitions, such as Activities of Daily Living and Working (ADL and ADW) for the product.
Mark Myers, CEO of British Friendly, said the society was pleased to lend its weight to the movement for change in the sector.
"We are pleased to pledge our support for this campaign and help to further build adviser and consumer trust in income protection," he said.
"To us it is simple. As a mutual, our policyholders are our members.
"If you are a plumber and can't work as a plumber, we want to pay you. We don't want to debate whether or not you can climb the stairs - that sort of thing only causes disputes and understandable anger," he added.
The society has joined fellow mutual society Cirencester friendly in the first wave of organisations to back the campaign.
Support for the campaign is open to all members involved in the income protection sector, including insurers, advisers, consultants and other bodies.
The Protection Review and adviser Roy McLoughlin of Master Adviser kicked off the drive with their support.