ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.2 > S86.29 > S86.299 S86.299 Other injury of muscle(s) and tendon(s) of anterior muscle group at lower leg level, unspecified leg Non-Billable/Non-Specific Codes S86.299A..., initial encounterS86.299D..., subsequent encounterS86.299S..., sequela