ICD-10-CM 2027
ICD-10 code for mucosal yaws
From the official ICD-10-CM alphabetic index entry “Yaws › mucosal”. Page updated September 29, 2026.
About coding mucosal yaws
The ICD-10-CM code for mucosal yaws is A66.7 (Other manifestations of yaws).
Within A66, choose A66.7 (Other manifestations of yaws) 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), latent yaws (A66.8) 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.
Common questions about mucosal yaws ICD-10 codes
What is the ICD-10 code for mucosal yaws?
- A66.7 — Other manifestations of yaws.
Is A66.7 billable?
- Yes. A66.7 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A66.7 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A66.7 as a principal diagnosis.
Is A66.7 a CC or MCC?
- No. A66.7 is neither a CC nor an MCC under MS-DRG v44.0.