how do I deduct medicare part C deductions I paid out of pocket not deducted from my social security check ?

[HelenC12]

Medicare programs—Part B (supplemental medical insurance), Part C (Medicare Advantage), and Part D (voluntary prescription drug insurance)—are deductible.

Enter them as health insurance in the medical expense section of TurboTax. See: Where do I enter my medical expenses?

[afmerriman]

list under insurance even if not itemizing?

[DavidD66]

If you are not itemizing, there will be no deduction for Medicare Part C expneses.  And if you are itemizing, you total medical expenses must be greater than 7.5% of your Adjusted Gross Income to get a deduction, and then only the amount in excess of 7.5% of AGI is deductible.