A9 https://stickfight.co.uk/wp-content/uploads/2023/07/A9.-HCPCS-Level-II-modifier-for-CPT-or-HCPCS-Level.mp3HCPCS Level II modifier for CPT or HCPCS Level II codes indicating wound dressing for nine or more wounds. The use of this modifier has an impact on Medicare payment.