Yes, RHIZOTOMIES is a Scrabble word!

Letter values in Scrabble US: R 1, H 4, I 1, Z 10, O 1, T 1, O 1, M 3, I 1, E 1, S 1.

Is it a valid word?

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

surgical procedure in which spinal nerve roots are cut; done (anterior roots) to relieve intractable pain or (posterior roots) to stop severe muscle spasms