2027 ICD-10-CM Diagnosis Code A66Yaws

ICD-10-CM Codes›A00–B99›A65-A69›A66

ICD-10-CM A66
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A66 is a non-billable ICD-10-CM category code for yaws, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A66.0, A66.1, A66.2, and A66.3.

Code Identity

ICD-10-CM Code
A66
Billable Status
No — Non-Billable Category
Code Describes
Yaws
Short Description
Yaws
Same as the full description in the CMS dataset.
Chapter
A65-A69
Other spirochetal diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA65-A69Other spirochetal diseases
CategoryA66Yaws
This CodeA66Yaws

Specific Coding for YawsOverview

Non-specific codes like A66 require more characters. Use one of these billable codes instead:

  • Use A66.0 for Initial lesions of yaws

  • Use A66.1 for Multiple papillomata and wet crab yaws

  • Use A66.2 for Other early skin lesions of yaws

  • Use A66.3 for Hyperkeratosis of yaws

  • Use A66.4 for Gummata and ulcers of yaws

  • Use A66.5 for Gangosa

  • Use A66.6 for Bone and joint lesions of yaws

  • Use A66.7 for Other manifestations of yaws

  • Use A66.8 for Latent yaws

  • Use A66.9 for Yaws, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A66: its own notes plus those printed at block A65-A69 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

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

On A66 itself
  • bouba
  • frambesia (tropica)
  • pian
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block A65-A69 Other spirochetal diseases applies to 28 codes
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical InformationClinical

  • Yaws

    a systemic non-venereal infection of the tropics caused by treponema pallidum subspecies pertenue.

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A66Overview

What is the ICD-10 code for yaws?

A66 is the ICD-10-CM category for yaws, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A66 (Yaws) a billable code?

No. This is a category header that groups the codes for yaws, and headers cannot be submitted on claims. Claims for yaws need a more specific code from this category, such as A66.0, A66.1, and A66.2.