Are Medicare Part B and Part D premiums considered "health insurance premiums"?

[SharonD007]

Yes, Medicare Parts B and D are health insurance premiums.   For more information, review the TurboTax Help article Can I deduct Medicare premiums?

[VolvoGirl]

But if you enter them from your Social Security SSA-1099 they automatically flow over to Schedule A itemized deductions so don't enter them again under Medical Deductions.  

But if you have self employment,  Medicare plan B payments are qualified as Self-employed medical insurance premiums and should be entered under Business instead of in the SSA-1099 Social Security Benefits section.