Latent yaws

This code represents the asymptomatic stage of yaws, a chronic tropical infection caused by the spirochete Treponema pallidum pertenue. During latent yaws, the patient shows no active skin lesions or other clinical signs, but serological tests for yaws remain positive, indicating past infection and the potential for relapse.

Use this code when documentation confirms a diagnosis of latent yaws, typically based on positive serological tests (e.g., VDRL, RPR, FTA-ABS) in a patient with a history of yaws but currently presenting without active lesions. This code is appropriate for surveillance or follow-up of individuals who have been treated for active yaws or who are identified through screening programs.

• Do not use this code if active yaws lesions are present; instead, code to the specific manifestation of active yaws.
• Ensure documentation clearly distinguishes between latent yaws and other treponemal infections like syphilis, as serological tests can be cross-reactive.
• This code is for historical purposes within ICD-9-CM and has a direct crosswalk to A66.5 in ICD-10-CM.