We have patients getting an echo to check and see if they are good candidates to receive chemotherapy. The echo is charged and, if the patient qualifies, they go back into the hospital on a different visit for the chemo which is charged separately. I’m trying to figure out what diagnosis would be best to put on the order for the echo. Any ideas would be appreciated. I have looked at:

Z01.810 – Encounter for preprocedural cardiovascular examination
Z01.818 – Encounter for other preprocedural examination