Intrathecal chemo via LP done weekly x 3

What are codes for performing
1. LP
2. Giving chemo (e.g; Methotrexate)

Do you code and bill for facility charge as well if done at clinic?
Sensor, when done q week, does there need to be a modifier?

re: Intrathecal chemo via LP done weekly x 3

Code 96450 includes the PL, do not bill LP separately.