Specialty
Dermatology Medical Billing
Lesion sizing, margins, and the line between medically necessary and cosmetic.
What makes dermatology billing different
Dermatology billing is measurement-driven. Excision codes are selected by lesion diameter plus the narrowest margins, measured before excision and recorded in the note. Reconstructing the size afterwards from a pathology report gives the wrong figure, because tissue shrinks in fixative.
The second theme is multiplicity. A single visit frequently involves several lesions at several sites treated by several methods, and reporting them separately depends on modifiers that are easy to apply wrongly in either direction.
Lesion size documented after the fact
Size plus margins must be recorded pre-excision. Using the pathology measurement systematically undersizes the code and the payment.
Benign versus malignant sequencing
Excision code selection depends on the pathology result, so the claim should wait for it. Billing early and correcting later creates avoidable rework.
Destruction versus excision versus biopsy
The 17000-series, 11400-series and 11102-series biopsy add-ons are distinct families. Mixing them is a common and expensive error.
Cosmetic versus medically necessary
Documentation has to establish functional impairment or malignancy risk. Without it the service is patient responsibility and needs handling up front.
Ask any billing company this
“How do you handle claims where pathology has not resulted yet?”
A company that bills your specialty properly will answer this in one sentence. A company that treats every specialty the same will answer it with a brochure.A note on accuracy. Coding rules, coverage policies and payer edits change continually, and the specifics above reflect general practice rather than any individual payer contract or local coverage determination. Treat this page as a map of where to look, not as coding advice for a particular claim.