G0457 HCPCS - NEGATIVE PRESSURE WOUND THERAPY, (E.G. VACUUM ASSISTED DRAINAGE COLLECTION) USING A MECHANICALLY-POWERED DEVICE, NOT DURABLE MEDICAL EQUIPMENT, INCLUDING PROVISION OF CARTRIDGE AND DRESSING(S), TOPICAL APPLICATION(S), WOUND ASSESSMENT, AND INSTRUCTIONS FOR ONGOING CARE, PER SESSION; TOTAL WOUNDS(S) SURFACE AREA GREATER THAN 50 SQUARE CENTIMETERS