Some cancer patients are still having to pay up to €63 a week in hospital car parking charges.
A survey of 26 public hospitals treating cancer patients shows 10 offer free car parking, while a further six give concessions on a daily or weekly basis.
The Irish Cancer Society, which carried out the survey, said, "ten hospitals still charge patients full costs - adding to the stress of people who already have other expenses. It's unfair that one patient being treated in Connolly Hospital in Dublin goes free, when another, 15 minutes down the Navan Road, pays up to €15 a day in the Mater Hospital, or that patients in Waterford pay €8, when those in Kilkenny pay nothing."
"Patients can feel the difference free car parking makes in their pocket at the end of the month, especially at a time when they're facing big losses in income, and are forking out a lot more by way of statutory charges, medication and increased heating and electricity bills, among other new or increased costs," said spokeman Donal Buggy.
It called on the HSE to publish guidelines on these charges. Patients also need better information on the concession available which they may not be aware of.
It comes as Cancer Week Ireland is marked by the Irish Cancer Society and Trinity College, Dublin.