ICD-10-CM > S00-T88 > S90-S99 > S96 > S96.9 > S96.91 S96.91 Strain of unspecified muscle and tendon at ankle and foot level Non-Billable/Non-Specific Codes S96.911Strain of unspecified muscle and tendon at ankle and foot level, right footS96.911A..., initial encounterS96.911D..., subsequent encounterS96.911S..., sequelaS96.912Strain of unspecified muscle and tendon at ankle and foot level, left footS96.912A..., initial encounterS96.912D..., subsequent encounterS96.912S..., sequelaS96.919Strain of unspecified muscle and tendon at ankle and foot level, unspecified footS96.919A..., initial encounterS96.919D..., subsequent encounterS96.919S..., sequela