Yes, BULIMIAS is a Scrabble word!

Letter values in Scrabble US: B 3, U 1, L 1, I 1, M 3, I 1, A 1, S 1.

Is it a valid word?

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

a disorder of eating seen among young women who go on eating binges and then feel guilt and depression and self-condemnation
pathologically insatiable hunger (especially when caused by brain lesions)

Also: binge-eating syndrome.