The average cost of an employer-offered family health insurance plan in 2017 was an eyewatering $18,764, up 3% from 2016. Employees paid an average of $5,714 or 31% of the premium. For an individual worker, coverage cost $6,690, a 4% rise over 2016 with the employee paying 18% or $1,204. Premium growth has slowed as employers move to plans with higher deductibles, now averaging $1,221/single-person, and larger co-pays. Insane!