Cutaneous diphtheria

This code represents a localized infection of the skin caused by Corynebacterium diphtheriae. It typically presents as a non-healing ulcer with a grayish membrane, often covered by a crust, and can occur on any skin surface. Unlike respiratory diphtheria, systemic toxicity is less common but can still occur.

Assign this code when documentation confirms a diagnosis of cutaneous diphtheria, often supported by bacterial culture identifying C. diphtheriae from a skin lesion. This diagnosis is typically made in patients presenting with chronic, non-healing skin ulcers, especially in endemic areas or among unvaccinated individuals.

• Differentiate from other skin infections; ensure the causative agent Corynebacterium diphtheriae is specified.
• Do not confuse with erythrasma (L08.1), which is a superficial bacterial infection caused by Corynebacterium minutissimum.
• Consider sequencing with codes for any associated systemic complications, such as myocarditis or neuropathy, if documented.