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v1.0.0
ICD-10 Guide
ICD-10 CodesA66.6

A66.6

Yaws of bones

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 A66.6 is a billable code used to indicate a diagnosis of yaws of bones.

Key Diagnostic Point:

Yaws is a chronic infectious disease caused by the spirochete Treponema pallidum pertenue, primarily affecting the skin, bones, and cartilage. Yaws of bones specifically refers to the osteitis or bone involvement that occurs in the later stages of the disease. The condition is characterized by the formation of gummas, which are soft tissue lesions that can lead to bone destruction and deformities. Yaws is endemic in tropical regions, particularly in parts of Africa, Southeast Asia, and the Pacific Islands. The disease is transmitted through direct skin contact with the lesions of an infected person, making it more prevalent in communities with poor sanitation and limited access to healthcare. Diagnosis is typically made based on clinical presentation and history of exposure, with serological tests available to confirm the infection. Treatment involves the administration of antibiotics, primarily benzathine penicillin, which is effective in curing the disease and preventing further complications. If left untreated, yaws can lead to significant morbidity, including chronic pain and disability due to bone involvement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of spirochetal diseases and their manifestations.
  • Differentiation from other treponemal infections.
  • Documentation of clinical findings related to bone involvement.
  • Knowledge of endemic areas for accurate coding.

Audit Risk Factors

  • Inadequate documentation of clinical findings.
  • Misdiagnosis due to similarity with other bone diseases.
  • Failure to document geographic exposure.
  • Inconsistent coding practices among providers.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed clinical history, serological test results, and treatment plans.

Common Clinical Scenarios

Patients presenting with skin lesions and joint pain in endemic areas.

Billing Considerations

Ensure documentation reflects the chronic nature and specific bone involvement.

Orthopedics

Documentation Requirements

Radiological findings, surgical notes if applicable, and follow-up care documentation.

Common Clinical Scenarios

Patients with chronic pain and deformities due to yaws-related osteitis.

Billing Considerations

Document any surgical interventions and their relation to yaws.

Coding Guidelines

Inclusion Criteria

Use A66.6 When
  • Follow the official ICD
  • CM coding guidelines for infectious diseases, ensuring accurate documentation of the condition's chronic nature and any associated complications
  • Include relevant patient history and geographic exposure

Exclusion Criteria

Do NOT use A66.6 When
No specific exclusions found.

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits after initial diagnosis and treatment of yaws.

Documentation Requirements

Document patient history, examination findings, and treatment response.

Specialty Considerations

Infectious disease specialists should ensure thorough documentation of treatment efficacy.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of yaws and its complications, improving the accuracy of epidemiological data and treatment tracking.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of yaws and its complications, improving the accuracy of epidemiological data and treatment tracking.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of yaws and its complications, improving the accuracy of epidemiological data and treatment tracking.

Resources

Clinical References

  • •
    World Health Organization - Yaws

Coding & Billing References

  • •
    World Health Organization - Yaws

Frequently Asked Questions

What is the primary cause of yaws?

Yaws is primarily caused by the spirochete Treponema pallidum pertenue, which is transmitted through direct contact with infected lesions.