ICD-11 classes
14 Diseases of the skin
Genetic and developmental disorders affecting the skin
Developmental anomalies of skin pigmentation
2F20.2 — Congenital melanocytic naevus
2F20.20 — Giant congenital melanocytic naevus

ICD-11 2F20.20 — Giant congenital melanocytic naevus

A congenital melanocytic naevus (CMN) with a predicted or final adult maximal diameter of 400 mm or more. Giant CMNs are commonly centred on the dorsal surface of the body between the vertex and the buttocks but may occur elsewhere; they may be associated with multiple smaller satellite naevi (congenital or tardive), hypertrichosis, lipomas or benign proliferative nodules. There is a risk of pre-pubertal melanoma within giant CMN or the central nervous system (CNS). Leptomeningeal melanocytosis or focal neuromelanosis, found in 10-15% of cases, is often associated with other CNS tumours, hydrocephalus, epilepsy, arachnoid cysts, or Dandy-Walker malformation.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.

The diagnosis is coded elsewhere:

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