ICD-10 Code for Yaws
The ICD-10-CM code for yaws is A66.9 — Yaws, unspecified. This is the code the Alphabetic Index gives for yaws with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
A66.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which yaws code should you use?
The Alphabetic Index lists 10 codes under Yaws. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| bone lesions | A66.6 | Bone and joint lesions of yaws | |
| butter | A66.1 | Multiple papillomata and wet crab yaws | |
| chancre | A66.0 | Initial lesions of yaws | |
| cutaneous, less than five years after infection | A66.2 | Other early skin lesions of yaws | |
| early | A66.2 | Other early skin lesions of yaws | |
| eyelid | A66.2 | Other early skin lesions of yaws | |
| ganglion | A66.6 | Bone and joint lesions of yaws | |
| gangosis, gangosa | A66.5 | Gangosa | |
| gumma, gummata | A66.4 | Gummata and ulcers of yaws | |
| hydrarthrosis | A66.6 | Bone and joint lesions of yaws | |
| hyperkeratosis | A66.3 | Hyperkeratosis of yaws | |
| initial lesions | A66.0 | Initial lesions of yaws | |
| joint lesions | A66.6 | Bone and joint lesions of yaws | |
| juxta-articular nodules | A66.7 | Other manifestations of yaws | |
| late nodular | A66.4 | Gummata and ulcers of yaws | |
| latent | A66.8 | Latent yaws | |
| mother | A66.0 | Initial lesions of yaws | |
| mucosal | A66.7 | Other manifestations of yaws | |
| multiple papillomata | A66.1 | Multiple papillomata and wet crab yaws | |
| nodular, late | A66.4 | Gummata and ulcers of yaws | |
| osteitis | A66.6 | Bone and joint lesions of yaws | |
| papilloma, plantar or palmar | A66.1 | Multiple papillomata and wet crab yaws | |
| periostitis | A66.6 | Bone and joint lesions of yaws | |
| specified NEC | A66.7 | Other manifestations of yaws | |
| ulcers | A66.4 | Gummata and ulcers of yaws | |
| wet crab | A66.1 | Multiple papillomata and wet crab yaws |
Yaws early
Yaws gumma, gummata
| bone | A66.6 | Bone and joint lesions of yaws |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources