Yes, DIGITALIZED is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, G 2, I 1, T 1, A 1, L 1, I 1, Z 10, E 1, D 2.

Is it a valid word?

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

put into digital form, as for use in a computer
administer digitalis such that the patient benefits maximally without getting adverse effects

Not playable in Scrabble US: DIGITISE, DIGITALISE.