Solved
Turbotax is only allowing a single character. This changes my federal due by over 400 dollars.
This is two codes, code 1 and code M. Each must be selected separately after indicating to TurboTax that box 7 has more than one code. Also, code M cannot be used for a distribution from an IRA, so the IRA/SEP/SIMPLE box must not be marked on the Form 1099-R provided by the payer or on TurboTax's 1099-R form.
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