ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.2 > S83.23 S83.23 Complex tear of medial meniscus, current injury Non-Billable/Non-Specific Codes S83.231Complex tear of medial meniscus, current injury, right kneeS83.231A..., initial encounterS83.231D..., subsequent encounterS83.231S..., sequelaS83.232Complex tear of medial meniscus, current injury, left kneeS83.232A..., initial encounterS83.232D..., subsequent encounterS83.232S..., sequelaS83.239Complex tear of medial meniscus, current injury, unspecified kneeS83.239A..., initial encounterS83.239D..., subsequent encounterS83.239S..., sequela