Yes, a rollover from the traditional 401(k) to the Roth 401(k) would be taxable and affect MAGI. Is there an amount in Box 2 or is the Taxable amount not determined checked in Box 2b?
An in plan Traditional 401(k) to 401(k) Roth rollover *is* a conversion.
A conversion to a Roth has an impact on your taxes. Typically, most or all of the amount would be taxable. A conversion of a Traditional IRA to a Roth IRA does affect MAGI.
Click this link for discussion on 401K to Roth 401K
Here's detail on Conversion you may find helpful.
This article on Calculating AGI/MAGI is also useful.
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