Yes, ILEUSES is a Scrabble word!

Letter values in Scrabble US: I 1, L 1, E 1, U 1, S 1, E 1, S 1.

Is it a valid word?

ILEUSES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel

Also: intestinal obstruction.