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ICD-10 Guide
DiagnosesRight Ankle Sprain

Right Ankle Sprain

ICD-10 Coding for Right Ankle Sprain(S93.401A, S93.421A)

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

Diagnosis Overview

What is Right Ankle Sprain?
Essential facts and insights about Right Ankle Sprain

Key Clinical Considerations:

  • Pain and swelling around the ankle
  • Bruising or discoloration
  • Limited range of motion
  • Instability of the ankle joint

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of injury mechanism
  • Physical examination findings
  • Imaging results if applicable
  • Treatment plan and follow-up

Coding Guidelines

Usage Guidelines & Examples

  • Ensure to differentiate between acute and chronic sprains.
  • Common errors include using incorrect laterality or encounter type.

Code Exclusions

Important Exclusions

  • Fractures of the ankle
  • Chronic ankle instability codes

Related ICD-10 Codes

Primary Codes
S93.401A
Sprain of unspecified ligament of right ankle, initial encounter
S93.402A
Sprain of anterior talofibular ligament of right ankle, initial encounter
Ancillary Codes
W00.0XXA
Differential Codes
S82.64XA
S96.919A

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • Athletes and active individuals
  • Emergency departments and orthopedic clinics

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

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

Documentation requirements?

Include details of the injury, physical exam findings, and any imaging results.

Billing considerations?

Ensure correct ICD-10 codes are used and document the encounter type (initial, subsequent, sequela).