U.S. ICD-10-CM · FY 2027

A66.4 ICD-10-CM Code: Gummata and ulcers of yaws

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

A66.4

Gummata and ulcers of yaws

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where A66.4 sits

  1. 1

    Chapter 1

    Certain infectious and parasitic diseases (A00-B99)

  2. 2

    Section

    Other spirochetal diseases (A65-A69)

  3. 3

    Category A66

    Yaws

  4. 4

    Code A66.4

    Gummata and ulcers of yaws

Documentation details

Notes for this code

Inclusion terms

  • Gummatous frambeside
  • Nodular late yaws (ulcerated)

Code first

No “code first” instruction is listed for A66.4.

Use additional code

No “use additional code” instruction is listed for A66.4.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for A66.4.

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for A66.4.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code A66.4 mean?

A66.4 is the FY 2027 U.S. ICD-10-CM code for “Gummata and ulcers of yaws.”

Is A66.4 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, A66.4 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is A66.4 located in ICD-10-CM?

A66.4 is listed in Chapter 1, Certain infectious and parasitic diseases (A00-B99), within Other spirochetal diseases (A65-A69) (A65–A69), under category A66, Yaws.

What coding notes are listed for A66.4?

Its listed inclusion terms are Gummatous frambeside; Nodular late yaws (ulcerated). No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.

Keep exploring

Related A66 codes

A66.0

Initial lesions of yaws

A66.1

Multiple papillomata and wet crab yaws

A66.2

Other early skin lesions of yaws

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