CPT 93230- How is this code applied? And what documentation is needed in the patinet's chart to suport this charge?

Also is this correct, Patient comes in for the hook up of the holter monitor. The M.A does this and documents it. We bill out CPT 93230. Then we schedule a follow up, the cardiologist reviews the results. Then we bill an E/M visit.

Thank You
Daniel, CPC