ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.3 > S86.39 > S86.399 S86.399 Other injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, unspecified leg Non-Billable/Non-Specific Codes S86.399A..., initial encounterS86.399D..., subsequent encounterS86.399S..., sequela