A66.4 Gummata and ulcers of yaws

The ICD-10-CM code for Gummata and ulcers of yaws is A66.4 (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 A66.4:

• Yaws › gumma, gummata
• Gumma (syphilitic) › ulcerative due to yaws
• Granuloma › tropicum
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › gumma, due to yaws
• Gumma (syphilitic) › yaws
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › yaws
• Frambeside › gummatous
• Yaws › late nodular (ulcerated)

Inclusion Terms

• Gummatous frambeside
• Nodular late yaws (ulcerated)

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