Private Medical Insurance inflation is running at six per cent according to the latest survey by Aon Consulting.
The healthcare intermediary surveyed 875 companies covering 315,000 insured members.
It found that most common single premium rate ranges between £251 and £300 a year.
The survey shows that the market is dominated by two companies PPP Healthcare and BUPA with 35 and 34 per cent of the market respectively.
The number of people expecting NHS services to deteriorate has increased to 24 per cent from 9 per cent in 1997.
It also found 46 per cent of firms use advisers to negotiate premiums of which 70 per cent choose not to disclose income or commission.
Aon believes that regulation may be appropriate in this sector.