ICD-10-CM > M00-M99 > M20-M25 > M23 > M23.0 > M23.03 M23.03 Cystic meniscus, other medial meniscus Non-Billable/Non-Specific Codes M23.031Cystic meniscus, other medial meniscus, right kneeM23.032Cystic meniscus, other medial meniscus, left kneeM23.039Cystic meniscus, other medial meniscus, unspecified knee