Surgical Dressing require the use of an “A” modifier to designate the number of wounds diagnosed when billing insurance. “A1” represents 1 wound, “A2” represents 2 wounds and so forth.
When using Compression Therapy in conjunction with the topical dressing, Modifier AW with RT or LT must be used to designate location.  Modifiers AW (Associated With) designates the use of the products together with the topical dressing and RT (Right) or LT (Left) designates which limb the products are prescribed.  Download the latest HCPCS Coding Guidance booklet from AMERX to learn more.