ICD-10-CM 2027
ICD-10 code for yaws
From the official ICD-10-CM alphabetic index entry “Yaws”. Page updated September 29, 2026.
About coding yaws
The ICD-10-CM code for yaws is A66.9 (Yaws, unspecified). The official index lists 32 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A66.9.
Within A66, choose A66.9 (unspecified) only when documentation doesn't support a more specific option: initial lesions of yaws (A66.0), multiple papillomata and wet crab yaws (A66.1), other early skin lesions of yaws (A66.2), Hyperkeratosis of yaws (A66.3), Gummata and ulcers of yaws (A66.4), Gangosa (A66.5), bone and joint lesions of yaws (A66.6), other manifestations of yaws (A66.7) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific yaws codes (official index)
- 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 (cutaneous) (macular) (maculopapular) (micropapular) (papular) A66.2 — Other early skin lesions of yaws
- frambeside A66.2 — Other early skin lesions of yaws
- skin lesions NEC 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
- bone A66.6 — Bone and joint lesions of yaws
- gummatous
- frambeside A66.4 — Gummata and ulcers of yaws
- osteitis A66.6 — Bone and joint lesions of yaws
- periostitis A66.6 — Bone and joint lesions of yaws
- hydrarthrosis A66.6 — Bone and joint lesions of yaws
- hyperkeratosis (early) (late) 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 (ulcerated) A66.4 — Gummata and ulcers of yaws
- latent (without clinical manifestations) (with positive serology) 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 (ulcerated) 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 (hypertrophic) 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
Common questions about yaws ICD-10 codes
What is the ICD-10 code for yaws?
- A66.9 — Yaws, unspecified. More specific codes apply when the documentation supports them: A66.6, A66.1, A66.0, A66.2 and others below.
What is the ICD-10 code for bone lesions yaws?
- A66.6 — Bone and joint lesions of yaws.
What is the ICD-10 code for butter yaws?
- A66.1 — Multiple papillomata and wet crab yaws.
What is the ICD-10 code for chancre yaws?
- A66.0 — Initial lesions of yaws.
What is the ICD-10 code for early yaws?
- A66.2 — Other early skin lesions of yaws.
What is the ICD-10 code for eyelid yaws?
- A66.2 — Other early skin lesions of yaws.
What is the ICD-10 code for ganglion yaws?
- A66.6 — Bone and joint lesions of yaws.
Is A66.9 billable?
- Yes. A66.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A66.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A66.9 as a principal diagnosis.
Is A66.9 a CC or MCC?
- No. A66.9 is neither a CC nor an MCC under MS-DRG v44.0.