In preparing your MD tax return, TurboTax goes by the fact that the Form 1099-R has code 7 and not code D in box 7 and does not have the IRA/SEP/SIMPLE box marked.
Note that your exclusion amount is $30,600 minus whatever amount of Social Security income you received. If you received $30,600 or more of Social Security income, you receive no pension exclusion. ($29,900 was the maximum pension exclusion for 2017.)
