Alphabetic Index FY2027

A66

Yaws

FY2027Chapter 1: Certain infectious and parasitic diseases/A65–A69 Other spirochetal diseases

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

A66 is a non-billable ICD-10-CM code category for yaws. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are A66.0 Initial lesions of yaws, A66.1 Multiple papillomata and wet crab yaws, A66.2 Other early skin lesions of yaws, A66.3 Hyperkeratosis of yaws and 6 more. Its coding notes include a Use additional code instruction and 7 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (7 notes)
Inherited from A65–A69 Other spirochetal diseases
  • leptospirosis (A27.-)
  • syphilis (A50-A53)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Includes

Further defines or gives examples of the content of the category.

This code
  • bouba
  • frambesia (tropica)
  • pian
Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • diseases generally recognized as communicable or transmissible

More specific codes under A66 10