The Director of Laya Healthcare, Donal Clancy, is urging the Government not to increase the health levy at the end of this month.
On March 31, the Government Health Levy will increase to €350 for an adult and €120 per child, on plans categorised as "advanced".
Mr Clancy's call comes after research found that one in three young families are planning on dropping their health insurance policies this year, saying they simply cannot afford it.
The Government's health levy charge has increased steadily over the past few years and Mr Clancy said it is not sustainable.
He said: "The Health Insurance levy is for risk equalisation, it is to ensure community rating continues, we would agree with the principle of it.
"The problem that we have and the fundamental problem that is going on with the health levy as it currently is, is the fact that it continues to go on while any increase in the levy is a subsidy for the VHI which is currently not regulated.
"Effectively it means that those who can afford it least are subsidising those who are on the higher plans."