ICD-10-CM 2027
ICD-10 code for Osteitis yaws
From the official ICD-10-CM alphabetic index entry “Yaws › osteitis”. Page updated September 29, 2026.
About coding Osteitis yaws
The ICD-10-CM code for Osteitis yaws is A66.6 (Bone and joint lesions of yaws).
Within A66 (yaws), A66.6 is specifically for bone and joint lesions of yaws. Related codes cover 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), other manifestations of yaws (A66.7), 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 548 (Septic Arthritis with MCC, relative weight 1.9519), DRG 549 (Septic Arthritis with CC, relative weight 1.1435) and DRG 550 (Septic Arthritis without CC/MCC, relative weight 0.8591), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), 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 Osteitis yaws ICD-10 codes
What is the ICD-10 code for Osteitis yaws?
- A66.6 — Bone and joint lesions of yaws.
Is A66.6 billable?
- Yes. A66.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A66.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A66.6 as a principal diagnosis.
Is A66.6 a CC or MCC?
- No. A66.6 is neither a CC nor an MCC under MS-DRG v44.0.