ICD-10-CM > S00-T88 > S90-S99 > S91 > S91.3 > S91.30 S91.30 Unspecified open wound of foot Non-Billable/Non-Specific Codes S91.301Unspecified open wound, right footS91.301A..., initial encounterS91.301D..., subsequent encounterS91.301S..., sequelaS91.302Unspecified open wound, left footS91.302A..., initial encounterS91.302D..., subsequent encounterS91.302S..., sequelaS91.309Unspecified open wound, unspecified footS91.309A..., initial encounterS91.309D..., subsequent encounterS91.309S..., sequela