He joins on loan with obligation to buy.
A statement on Parma's website adds Karamoh has put pen to paper on a four-year contract.
It is reported their obligation to buy, which takes effect next summer, is worth €13m.
The Nerazzurri paid €6.5m to sign Karamoh from Caen in the summer of 2017.
Parma Calcio 1913 (@1913parmacalcio) July 17, 2019