ICD-10-CM > S00-T88 > S80-S89 > S86 > S86.9 > S86.91 S86.91 Strain of unspecified muscle and tendon at lower leg level Non-Billable/Non-Specific Codes S86.911Strain of unspecified muscle(s) and tendon(s) at lower leg level, right legS86.911A..., initial encounterS86.911D..., subsequent encounterS86.911S..., sequelaS86.912Strain of unspecified muscle(s) and tendon(s) at lower leg level, left legS86.912A..., initial encounterS86.912D..., subsequent encounterS86.912S..., sequelaS86.919Strain of unspecified muscle(s) and tendon(s) at lower leg level, unspecified legS86.919A..., initial encounterS86.919D..., subsequent encounterS86.919S..., sequela