A18.4

Applicable To

• Erythema induratum, tuberculous

• Lupus excedens

• Lupus vulgaris NOS

• Lupus vulgaris of eyelid

• Scrofuloderma

• Tuberculosis of external ear

Approximate Synonyms

• Tuberculosis tb) of subcutaneous tissue

• Tuberculosis tb) verrucosa cutis

• Tuberculosis tb) with erythema nodosum

• Tuberculosis of subcutaneous cellular tissue

• Tuberculosis verrucosa cutis

• Tuberculous erythema nodosum

Clinical Information

• A form of cutaneous tuberculosis. It is seen predominantly in women and typically involves the nasal mucosa; buccal mucosa; and conjunctival mucosa.

• A type of panniculitis characterized histologically by the presence of granulomas, vasculitis, and necrosis. It is traditionally considered to be the tuberculous counterpart of nodular vasculitis, but is now known to occur without tuberculous precedent. It is seen most commonly in adolescent and menopausal women, is initiated or exacerbated by cold weather, and typically presents as one or more recurrent erythrocyanotic nodules or plaques on the calves. The nodules may progress to form indurations, ulcerations, and scars.

Details

• A18.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM A18.4 became effective on October 1, 2022.

• This is the American ICD-10-CM version of A18.4 – other international versions of ICD-10 A18.4 may differ.