The Association of Medical Insurance Intermediaries (AMII) has seen a significant increase in membership over the past six months.
The body is crediting the creation of a joint private medical insurance (PMI) exam with the CII for much of its success.
Since the launch in April, the Association has welcomed 15 new member firms with another seven currently being referenced, lifting the membership total to more than 100 firms.
Michael Payne, general secretary of AMII said: "We are delighted to see more health insurance intermediaries looking to demonstrate their professionalism in this specialist sector of the insurance market."
"With the recent announcement by the Office of Fair Trading (OFT) of a review into the private healthcare market, the current Government's plans for reforming the NHS and the replacement of the Financial Services Authority (FSA) by the Consumer Protection and Markets Authority (CPMA), we believe it is now more important than ever that the voice of the specialist healthcare intermediary is heard with representation from a strong Association that truly understands the unique requirements of this sector."