Yes, SURGICAL is a Scrabble word!

Letter values in Scrabble US: S 1, U 1, R 1, G 2, I 1, C 3, A 1, L 1.

Is it a valid word?

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

of or relating to or involving or used in surgery
relating to or requiring or amenable to treatment by surgery especially as opposed to medicine
performed with great precision