ICD-10-CM > S00-T88 > S80-S89 > S81 > S81.0 > S81.05 S81.05 Open bite of knee Non-Billable/Non-Specific Applicable To Bite of knee NOS Type 1 Excludes superficial bite of knee (S80.27-) Codes S81.051Open bite, right kneeS81.051A..., initial encounterS81.051D..., subsequent encounterS81.051S..., sequelaS81.052Open bite, left kneeS81.052A..., initial encounterS81.052D..., subsequent encounterS81.052S..., sequelaS81.059Open bite, unspecified kneeS81.059A..., initial encounterS81.059D..., subsequent encounterS81.059S..., sequela