ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.9 > S86.99 > S86.991 S86.991 Other injury of unspecified muscle(s) and tendon(s) at lower leg level, right leg Non-Billable/Non-Specific Codes S86.991A..., initial encounterS86.991D..., subsequent encounterS86.991S..., sequela