A66
⚠ Non-billable
Yaws
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
A66
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code A66?
ICD-10-CM code A66 represents Yaws. It is a non-billable header code requiring a more specific subcategory in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is A66 billable?
No. A66 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is A66 in?
A66 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
Related codes in the A66 category
A66.0
Initial lesions of yaws
Billable
A66.1
Multiple papillomata and wet crab yaws
Billable
A66.2
Other early skin lesions of yaws
Billable
A66.3
Hyperkeratosis of yaws
Billable
A66.4
Gummata and ulcers of yaws
Billable
A66.5
Gangosa
Billable
A66.6
Bone and joint lesions of yaws
Billable
A66.7
Other manifestations of yaws
Billable
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