HCPCS code A6402: Gauze, non-impregnated, sterile, pad size 16 sq. in. or less, without adhesive border, each dressing

The main difference lies in the dressing's size, whether it's impregnated with a substance, and if it has an adhesive border. For example, A6403 is for a sterile, non-impregnated gauze pad larger than 16 sq. in. but less than or equal to 48 sq. in.

No. The dressing must be for a "qualifying wound" as defined by payer policies, typically a surgical wound or a wound that has been debrided.

Generally, non-sterile gauze dressings (like A6216) may also be covered, but coverage depends on the specific payer's policy and the medical necessity of a non-sterile dressing for the particular wound.