Clinical Context
A typical patient is an adult undergoing treatment with a topical or surface-applied dermatologic product that is billed by area of application. The service is an add-on, reported per square centimeter, and is used when an additional product component (for example, an advanced wound coverage, specialized topical adhesive, or a proprietary acellular component identified as Summit AC) is applied in addition to a primary procedure such as wound debridement, excision, or lesion removal.
A realistic workflow: The patient presents to an outpatient dermatology or wound care clinic with a chronic nonhealing lower-extremity ulcer. The clinician performs wound assessment and primary procedure (debridement and cleansing). After addressing the wound bed, the clinician applies the specialized Summit AC product to the wound surface; the product is measured and billed per square centimeter using the add-on HCPCS Level II code Q4398 in addition to the primary procedure CPT code(s). Documentation includes wound measurements (length × width to calculate cm2), indication for the product, time of application, lot/batch numbers if applicable, and the primary procedure(s) performed during the same encounter. Typical sites of service include outpatient wound care clinics, dermatology offices, ambulatory surgical centers, and hospital outpatient departments.
Common patient factors include chronic diabetic or venous ulcers, post-operative surgical sites requiring advanced topical coverage, or acute traumatic wounds where an adjunctive topical component is used to aid healing or protect the wound after the primary procedure.