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v1.0.0
ICD-10 Guide
DiagnosesAtfl Sprain

Atfl Sprain

ICD-10 Coding for ATFL Sprain(S93.42XA)

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

Diagnosis Overview

What is Atfl Sprain?
Essential facts and insights about ATFL Sprain

Key Clinical Considerations:

  • Presence of pain and tenderness over the anterior talofibular ligament (ATFL)
  • Positive anterior drawer test
  • Swelling and bruising around the ankle joint
  • Limited range of motion of the ankle joint

Clinical Information

Clinical Criteria & Documentation Requirements

  • Detailed description of the patient's symptoms
  • Results of physical examination, including specific tests
  • Imaging results, if applicable
  • Specific location of the injury (right, left, bilateral)

Coding Guidelines

Usage Guidelines & Examples

  • S93.42XA is specifically for initial encounter of ATFL sprain
  • For subsequent encounters, use S93.42XD
  • For sequela of ATFL sprain, use S93.42XS

Code Exclusions

Important Exclusions

  • Chronic or recurrent sprains of the ATFL
  • Sprains of other ligaments of the ankle

Related ICD-10 Codes

Primary Codes
S93.42XA
Sprain of anterior talofibular ligament of ankle, initial encounter
Ancillary Codes
Z87.81
Differential Codes
S82.8XXA

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • Acute sprain of the anterior talofibular ligament
  • Injury occurred during sports or a similar physical activity
  • Injury due to a fall or misstep

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

Patient presents with acute onset of ankle pain following a [describe incident]. Examination reveals tenderness over the ATFL and positive anterior drawer test.

Template 2

Imaging studies confirm diagnosis of ATFL sprain. Plan is for conservative management with rest, ice, compression, and elevation.

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 is an ATFL sprain?

An ATFL sprain is an injury to the anterior talofibular ligament in the ankle, often due to a sudden twist or turn.

When should this code be used?

This code should be used for the initial encounter for care of an acute ATFL sprain.