ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.9 > S86.99 > S86.999 S86.999 Other injury of unspecified muscle(s) and tendon(s) at lower leg level, unspecified leg Non-Billable/Non-Specific Codes S86.999A..., initial encounterS86.999D..., subsequent encounterS86.999S..., sequela