Meanwhile, National Friendly has followed the launch of its new health insurance proposition, MyPMI, in October last year by joining the amii ranks.
Oliver Jones, sales and distribution director at National Friendly, said: "We have been expanding our distribution footprint and have diversified our product range including the launch of our new MyPMI product, but we identified that we need to be part of amii in order to reach out to the Private Healthcare Market and gain further traction.
"We are looking at building our relationship with amii and its members as now more than ever, private healthcare can support clients' needs. I am looking forward to seeing what we can achieve."
The two new additions bring total amii membership to 121 intermediary and 15 corporate members, with 16 intermediaries joining during 2022.
amii executive chairman, David Middleton, added: "We are delighted that Health Shield has re-joined the AMII family and also welcome National Friendly as a valued member and look forward to working closely with both mutuals as we move forward.
"2022 was a significant year in the history of amii - with record-breaking membership recruitment and a rebrand - and we are very confident of continued strategic growth in 2023."