Lesion Destruction Coding: 17000, 17003, 17004 and 17110

The unit arithmetic that gets lost

• One actinic keratosis destroyed: 17000, one unit.
• Six destroyed: 17000 once, plus 17003 with five units. Reporting 17000 alone loses five units of payment.
• Fifteen or more destroyed: 17004 once, as a single all-inclusive unit. Reporting 17000 plus 14 units of 17003 alongside 17004 is a duplicate and will deny.
• Fourteen destroyed is 17000 plus 13 units of 17003 — the boundary between the stacked codes and 17004 is exactly at fifteen, and rounding it the wrong way costs in both directions.

Premalignant versus benign versus malignant

17000 through 17004 apply to premalignant lesions, which in dermatology practice overwhelmingly means actinic keratoses. Benign lesions — seborrheic keratoses, verrucae, molluscum — are destroyed under 17110 for up to fourteen lesions and 17111 for fifteen or more, and these are single codes covering a range rather than a primary-plus-add-on structure. Malignant lesion destruction is a separate family entirely, coded by site and size.

The most frequent error is treating the benign codes as though they carried add-on units. 17110 is reported once whether one lesion or fourteen were destroyed; adding units multiplies nothing except the chance of a unit-count denial.

Medical necessity and payer coverage limits

Actinic keratosis destruction is covered by Medicare and most commercial payers, but several Medicare Administrative Contractors publish local coverage determinations that set expectations on documented lesion characteristics and on frequency of repeat destruction at the same site. A destruction repeated at a short interval on a site already treated needs the note to explain persistence rather than simply repeating the original indication.

Benign lesion destruction is where coverage usually fails. Seborrheic keratoses removed for appearance are not covered, and payers expect documentation of a functional problem — bleeding, irritation from clothing, recurrent inflammation, or genuine inability to exclude malignancy. A note that records only the lesion's presence will not carry the claim.

Documentation that makes the unit count defensible

• The count of lesions destroyed, stated as a number rather than implied by a list.
• The anatomical distribution, at least by region, so the count is reconcilable.
• The destruction method — cryotherapy, electrodesiccation, curettage, chemical.
• For benign lesions, the functional symptom or diagnostic uncertainty that establishes medical necessity.
• For repeat treatment of a previously treated site, the clinical course since the last destruction.