ICD-10-CM > M00-M99 > M20-M25 > M23 > M23.0 > M23.01 M23.01 Cystic meniscus, anterior horn of medial meniscus Non-Billable/Non-Specific Codes M23.011Cystic meniscus, anterior horn of medial meniscus, right kneeM23.012Cystic meniscus, anterior horn of medial meniscus, left kneeM23.019Cystic meniscus, anterior horn of medial meniscus, unspecified knee