ALC Health has announced it will have all its claims handling carried out by Healix International from 1 January 2015.
The change will affect both new and renewing customers, and will be part of an exclusive arrangement.
Healix maintain a medically backed 24 hours a day and year round claims handling service with call centres in the UK, New Zealand and Singapore.
ALC Health are also extending their commitment to AXA PPP International as their main underwriting partner.
Sarah Jewell, CEO of ALC Health, said: "Our company has been built on an absolute dedication to customers, service and quality. We have enjoyed unprecedented growth and support from our customers and brokers and, as we continue on our journey, we are delighted that we can add a partner with the stature and reputation of Healix International to underline our continuing commitment to them.
"We believe that by partnering with Healix International we will be providing the most customer focused claims handling service in the industry, with qualified medical personnel involved at the notification stage and proactive control and settlement throughout the process."
She added ALC Health would "shortly unveil further developments."