Version 2024

2024 ICD-10-CM Diagnosis Code A66


ICD-10-CM Code:
ICD-10 Code for:
Is Billable?
Not Valid for Submission
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Code Classification

  • Certain infectious and parasitic diseases

A66 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of yaws. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Yaws

Non-specific codes like A66 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for yaws:

  • Use A66.0 for Initial lesions of yaws - BILLABLE CODE

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

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

  • Use A66.3 for Hyperkeratosis of yaws - BILLABLE CODE

  • Use A66.4 for Gummata and ulcers of yaws - BILLABLE CODE

  • Use A66.5 for Gangosa - BILLABLE CODE

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

  • Use A66.7 for Other manifestations of yaws - BILLABLE CODE

  • Use A66.8 for Latent yaws - BILLABLE CODE

  • Use A66.9 for Yaws, unspecified - BILLABLE CODE

Clinical Information

  • Yaws

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

    the causative agent of venereal and non-venereal syphilis as well as yaws.
  • Early Yaws

    early yaws includes primary and secondary stages of yaws, endemic tropical treponemal nonvenereal infection: development of initial lesion at inoculation site followed by widespread dissemination of treponemes and generalized secondary granulomatous lesions that may relapse repeatedly.
  • Late Yaws

    late yaws is the tertiary, non-contagious stage of yaws, endemic tropical treponemal nonvenereal infection. late yaws is characterized by destructive and deforming lesions of the skin, bones, and joints.
  • Yaws

    an endemic, infectious, nonvenereal disease in humans that presents mainly in children younger than 15 years. the disease occurs primarily in warm, humid, tropical areas of africa, asia, south america, and oceania, among poor rural populations where conditions of overcrowding and poor sanitation prevail. infection with treponema pertenue, a subspecies of treponema pallidum, causes the disease.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • bouba
  • frambesia (tropica)
  • pian

Patient Education

Bacterial Infections

Bacteria are living things that have only one cell. Under a microscope, they look like balls, rods, or spirals. They are so small that a line of 1,000 could fit across a pencil eraser. Most types of don't make you sick. Many types are helpful. Some of them help to digest food, destroy disease-causing cells, and give the body needed vitamins. Bacteria are also used in making healthy foods like yogurt and cheese.

But infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include Streptococcus, Staphylococcus, and E. coli.

Antibiotics are the usual treatment. When you take antibiotics, follow the directions carefully. Each time you take antibiotics, you increase the chances that bacteria in your body will learn to resist them causing antibiotic resistance. Later, you could get or spread an infection that those antibiotics cannot cure.

NIH: National Institute of Allergy and Infectious Diseases

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.