Medicare Premiums

As a retired federal civil service employee, I do not receive Social Security but pay my Medicare Part D premiums directly to Medicare.  TurboTax program does not ask for this information and so I've been including it as an additional deductible medical insurance cost.  What line should I report it on?  This affects my state income tax so want to do it correctly.  The TurboTax program should be updated to cover people in my situation.  Thanks!