ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.8 > S86.81 S86.81 Strain of other muscles and tendons at lower leg level Non-Billable/Non-Specific Codes S86.811Strain of other muscle(s) and tendon(s) at lower leg level, right legS86.811A..., initial encounterS86.811D..., subsequent encounterS86.811S..., sequelaS86.812Strain of other muscle(s) and tendon(s) at lower leg level, left legS86.812A..., initial encounterS86.812D..., subsequent encounterS86.812S..., sequelaS86.819Strain of other muscle(s) and tendon(s) at lower leg level, unspecified legS86.819A..., initial encounterS86.819D..., subsequent encounterS86.819S..., sequela