ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.3 > S86.31 > S86.311 S86.311 Strain of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, right leg Non-Billable/Non-Specific Codes S86.311A..., initial encounterS86.311D..., subsequent encounterS86.311S..., sequela