A66.0 Initial lesions of yaws

The ICD-10-CM code for Initial lesions of yaws is A66.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

A65-A69: Other spirochetal diseases (A65-A69)

Category A66

11 codes (10 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A66.0:

• Mother yaw
• Yaws › mother
• Yaws › initial lesions
• Yaws › chancre
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › frambesial, initial
• Frambesia, frambesial (tropica) › primary
• Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) › yaws
• Frambesia, frambesial (tropica) › initial lesion or ulcer

Inclusion Terms

• Chancre of yaws
• Frambesia, initial or primary
• Initial frambesial ulcer
• Mother yaw

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool