Series creator Ryan Murphy shared the news on Twitter Sunday, and hinted that the story arc for Greenfield's character may come to an unpleasant end.
This October, Max Greenfield (like you've never seen him) is checking in to the hotel....but not checking out. #AHSHotel— Ryan Murphy (@MrRPMurphy) May 25, 2015
Greenfield joins a cast of previously announced stars including Lady Gaga, Matt Bomer, Wes Bentley, Cheyenne Jackson, Sarah Paulson, Kathy Bates and Chloe Sevigny.
American Horror Story: Hotel is expected to premiere on FX in October.