ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.9 > S86.91 > S86.911 S86.911 Strain of unspecified muscle(s) and tendon(s) at lower leg level, right leg Non-Billable/Non-Specific Codes S86.911A..., initial encounterS86.911D..., subsequent encounterS86.911S..., sequela