ICD-10 Code A66.1 – Multiple papillomata and wet crab yaws (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A66.1 – Multiple papillomata and wet crab yaws
What it is
A66.1 identifies the yaws manifestation called multiple papillomata, also known as wet crab yaws. It is a treponemal infection stage marked by papillomatous skin lesions.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include multiple moist, raised papillomatous lesions, often on the skin, with possible crusting or ulceration.
When to use this code
Use A66.1 when the provider documents multiple papillomata or wet crab yaws as the diagnosed form of yaws. Code it when the record clearly identifies this specific manifestation rather than yaws in general. Check documentation if the lesion type or stage is unclear.
Do not use for
Do not use this code for other yaws stages or for nonspecific skin papillomas without documented yaws. If the chart does not confirm the diagnosis, check documentation.
Coding tip
Assign A66.1 only when the note links the skin lesions to yaws and names the multiple papillomata or wet crab yaws form.