What does ICD-10 code A66 mean?

ICD-10 code A66 is the standardized code used for yaws in medical records and coding systems.

When is ICD-10 code A66 used?

Doctors, hospitals, and insurers may use ICD-10 code A66 when recording yaws in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code A66 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code A66: Yaws

Name: ICD-10 Code A66: Yaws
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:00:46.347Z

A66 is an ICD-10 diagnosis entry used to group records related to Yaws. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

May be used when a clinician documents yaws in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

1Certain infectious and parasitic diseases (A00-B99)

block

A65-A69Other spirochetal diseases

currentA65-A69

Official coding notes

Includes

bouba
frambesia (tropica)
pian

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral Physician

Sibling codes

A65Nonvenereal syphilisbillable A67Pinta [carate]A68Relapsing fevers A69Other spirochetal infections

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

A66

Replacement codes

A66.0 — Initial lesions of yawsA66.1 — Multiple papillomata and wet crab yawsA66.2 — Other early skin lesions of yawsA66.3 — Hyperkeratosis of yawsA66.4 — Gummata and ulcers of yawsA66.5 — GangosaA66.6 — Bone and joint lesions of yawsA66.7 — Other manifestations of yawsA66.8 — Latent yawsA66.9 — Yaws, unspecified

Common synonyms

Yaws

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.