how much does remov ext immobilization cost.
select distinct cost.cost from cost where cost.event_type = 'procedures_icd' and cost.event_id in ( select procedures_icd.row_id from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'remov ext immobilization' ) )