M23.0 - Cystic meniscus
M23.01 - Cystic meniscus, anterior horn of medial meniscus
M23.011 - Cystic meniscus, anterior horn of medial meniscus, right knee
M23.012 - Cystic meniscus, anterior horn of medial meniscus, left knee
M23.019 - Cystic meniscus, anterior horn of medial meniscus, unspecified knee