You cannot deduct medical expenses or long term care expenses that you receive payment for from insurance, unless your expenses exceed the amount of your insurance benefits. The fact that LTC benefits are considered non-taxable (up to certain limits) does not mean that the LTC expenses paid are tax deductible. To the extent your expenses do not exceed your LTC benefits, those expenses are not deductible. You cannot, as you say double dip. You can deduct the cost of the LTC premiums if they are still being paid.
As for there being something in the tax code that prohibits your deducting the medical costs that were paid for with LTC insurance benefits - there is not something specific that I am aware of. Nor am I aware of anything that says you can. Not every situation is addressed in the code or in an IRS Publication or Form Instructions. But it is a general principal of the tax code that you cannot deduct as an expense something for which you are reimbursed, unless that reimbursement is also reported as income.
[Edited 02-12-2024, 2:27 PM EDT]
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