If you were on Medicare in 2020, you won't have a 1095-A to enter. You will enter your SSA-1099 in the Income section.
Medicare Premiums are a 'standard rate' for most people, unless you earned over the income threshold. If you went on Medicare in 2019, your premium would be based on your 2018 income.
Not including your 1095-A on your 2019 taxes would not negatively affect your Medicare premiums calculated for 2020, as it would not have reduced your income.
Click this link for more info on Income and Medicare Premiums.
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