 The cost of these supplemental plans is relatively modest (costing an equivalent of US$10 to $35 per month for an adult depending on age group and coverage tier in 2019).The health funds are prohibited by law from denying any member participation in a supplementary health insurance plan, and may not charge different premiums due to pre-existing conditions, although they usually impose an initial waiting period before supplemental coverage takes effect.Supplemental plans are heavily promoted by the health funds and as of 2017 more than three quarters of all Israelis subscribe to them.