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ICD-10 Guide
DiagnosesAchilles Tendon Rupture

Achilles Tendon Rupture

ICD-10 Coding for Achilles Tendon Rupture(S86.011A, S86.012A, S86.019A)

PRIMARY SPECIALTYEmergency Medicine
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Achilles Tendon Rupture?
Achilles tendon rupture is a common injury characterized by a complete tear of the Achilles tendon, which connects the calf muscles to the heel bone. This injury often occurs during activities that involve sudden acceleration or deceleration, such as running or jumping. Key clinical points include: 1) It typically presents with sudden pain in the back of the ankle, often described as being kicked; 2) Patients may experience swelling, bruising, and difficulty walking; 3) A positive Thompson test (absence of plantar flexion when the calf is squeezed) is a classic diagnostic indicator. The etiology often involves degeneration of the tendon due to chronic overuse or acute trauma. Pathophysiologically, the rupture leads to a loss of function in the calf muscle, resulting in impaired mobility. Clinical presentation may vary from mild discomfort to severe pain and functional impairment, necessitating prompt medical evaluation and intervention.

Key Clinical Considerations:

  • Diagnosis is confirmed through clinical examination and imaging studies, such as ultrasound or MRI.
  • Signs include sudden pain, swelling, and a palpable gap in the tendon; symptoms may include difficulty in plantar flexion.
  • Resolution criteria involve the restoration of normal ankle function and pain-free movement.
  • Imaging findings may show a complete tear of the tendon with retraction of the tendon ends.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Documentation must include details of the mechanism of injury, clinical findings, and imaging results.
  • Compliant documentation includes clear descriptions of symptoms and physical exam findings; non-compliant documentation may lack specificity.
  • Template phrases: 'Patient presents with sudden onset of pain in the posterior ankle following [activity].' or 'Imaging confirms complete rupture of the Achilles tendon.'
  • Medical necessity must be established through documentation of functional impairment and treatment rationale.

Coding Guidelines

Usage Guidelines & Examples

  • Use S86.011A for a right Achilles tendon rupture, S86.012A for a left rupture, and S86.019A for unspecified; examples include sports injuries or falls.
  • Do not use these codes for partial tears or tendinopathy.
  • Correct usage: 'Patient diagnosed with S86.011A after a sports injury'; incorrect: 'Patient has ankle pain, code unspecified.'
  • Common errors include misclassifying the type of tear; ensure accurate assessment of the injury.

Code Exclusions

Important Exclusions

  • Excluded conditions include partial Achilles tendon tears and chronic tendinopathy; these require different codes.
  • Alternative codes for exclusions include M76.60 for Achilles tendinopathy.
  • Common exclusion errors involve misdiagnosing a partial tear as a complete rupture; clarify imaging results.
  • Certain conditions are excluded to ensure accurate representation of the injury severity.

Related ICD-10 Codes

Primary Codes
S86.011A
Complete rupture of right Achilles tendon, initial encounter
S86.012A
Complete rupture of left Achilles tendon, initial encounter
Ancillary Codes
73721
Differential Codes
S86.21XA

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

  • This diagnosis applies to acute injuries from sports, falls, or sudden movements.
  • Appropriate in emergency settings where immediate assessment and intervention are required.
  • Inpatient settings may involve surgical repair, while outpatient settings may focus on rehabilitation.
  • Specialty considerations include orthopedics and sports medicine.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Achilles tendon rupture diagnosed based on clinical findings and MRI results.'

Template 2

Template: 'Patient presents with sudden pain and swelling consistent with Achilles tendon rupture.'

Template 3

Template: 'Diagnostic criteria met: positive Thompson test and imaging confirms complete rupture.'

Template 4

Template: 'Treatment plan includes surgical repair and rehabilitation for Achilles tendon rupture.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this code?

Detailed documentation should include mechanism of injury, clinical findings, and imaging results.

When should this code be used vs similar codes?

Use this code for complete ruptures; use other codes for partial tears or tendinopathy.

What are common billing issues with this code?

Reimbursement may be denied if documentation does not support the diagnosis; ensure clarity.

What procedures are commonly associated?

Commonly associated CPT codes include surgical repair codes and physical therapy codes.