Do I deduct premiums for medicare and my supplement insurance

When you report your social security income you also are reporting your Medicare premiums which automatically are included in your itemized medical expenses on Sch A if you itemize. You can then add your supplemental insurance premiums when you work on your itemized deductions.  You can only deduct an amount of medical expenses greater than 7.5 percent of your AGI. 

Yes, Medicare Part B premiums are a deductible health insurance premium.

Medicare Part A premiums aren't deductible if you're covered under Social Security or if you're a government employee who paid Medicare tax.

• However, if you aren't covered under Social Security (nor a government employee who paid Medicare tax) and you voluntarily enrolled in Medicare A, you can deduct those premiums.

Yes, premiums for supplemental medical insurance, Part C (Medicare Advantage), and Part D (voluntary prescription drug insurance)—are deductible.

• To get the medical expense deduction, the sum of all your itemized deductions (which also includes things like donations and property taxes) must exceed your standard deduction amount.
• You're only allowed to deduct medical expenses that go above and beyond 7.5% of your AGI.