I have money left in my HSA account from year 2016 & 2017. This year I don't have high deductible health plan and only have FSA. Is my FSA limited purpose that only reimburses dental and vision expenses until I use up all the money in my HSA?
It depends on the specific rules of your plan. You need to talk to the plan administrator to get the facts, as they pertain to you. This is especially important with the tax law changes that kicked in for 2018.