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ICD-10 Guide
ICD-10 CodesM66.869

M66.869

Billable

Spontaneous rupture of other tendons, unspecified lower leg

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/17/2025

Code Description

ICD-10 M66.869 is a billable code used to indicate a diagnosis of spontaneous rupture of other tendons, unspecified lower leg.

Key Diagnostic Point:

Spontaneous rupture of tendons in the lower leg can occur due to various factors, including underlying degenerative conditions, acute trauma, or chronic overuse. This condition is characterized by the sudden tearing of tendons, which may lead to significant pain, swelling, and functional impairment. The lower leg comprises several tendons, including those associated with the Achilles, peroneal, and tibialis muscles. The spontaneous rupture of these tendons can result from conditions such as tenosynovitis, where inflammation of the tendon sheath leads to weakening and eventual rupture. Diagnosis typically involves a thorough clinical examination, imaging studies such as ultrasound or MRI, and assessment of the patient's history. Treatment may vary from conservative management, including rest and physical therapy, to surgical intervention for repair or reconstruction of the ruptured tendon. Accurate coding is essential for proper reimbursement and to reflect the complexity of the patient's condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of tendon rupture
  • Need for precise documentation of the spontaneous nature of the rupture
  • Differentiation from traumatic ruptures and other tendon-related conditions
  • Potential for co-existing conditions affecting treatment and coding

Audit Risk Factors

  • Inadequate documentation of the spontaneous nature of the rupture
  • Failure to specify the tendon involved, leading to unspecified coding
  • Lack of imaging studies to support the diagnosis
  • Inconsistent treatment documentation, particularly regarding surgical interventions

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes, imaging results, and treatment plans must be documented.

Common Clinical Scenarios

Patients presenting with acute pain and swelling in the lower leg, often after a sudden increase in activity.

Billing Considerations

Documentation should clearly state the mechanism of injury and any pre-existing conditions that may have contributed to the rupture.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive assessment of functional limitations and rehabilitation goals.

Common Clinical Scenarios

Patients requiring rehabilitation post-surgery or conservative management for tendon ruptures.

Billing Considerations

Focus on documenting the patient's functional status and progress throughout rehabilitation.

Coding Guidelines

Inclusion Criteria

Use M66.869 When
  • Follow official ICD
  • 10 coding guidelines, ensuring that the code is used only when the rupture is spontaneous and not due to trauma
  • Document any relevant clinical findings and imaging results

Exclusion Criteria

Do NOT use M66.869 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27301CPT Code

Repair of tendon, lower leg

Clinical Scenario

Used when surgical repair is performed for spontaneous tendon rupture.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Orthopedic surgeons must document the specific tendon repaired and the surgical technique used.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of tendon ruptures, improving the ability to capture the nuances of spontaneous versus traumatic injuries. This specificity aids in better patient management and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of tendon ruptures, improving the ability to capture the nuances of spontaneous versus traumatic injuries. This specificity aids in better patient management and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the difference between spontaneous and traumatic tendon rupture?

Spontaneous tendon rupture occurs without a specific traumatic event, often due to underlying degenerative conditions, while traumatic rupture is the result of an acute injury or excessive force applied to the tendon.