Yes, BIOFEEDBACK is a Scrabble word!

Letter values in Scrabble US: B 3, I 1, O 1, F 4, E 1, E 1, D 2, B 3, A 1, C 3, K 5.

Is it a valid word?

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

a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them