M23.0 - Cystic meniscus
M23.05 - Cystic meniscus, posterior horn of lateral meniscus
M23.051 - Cystic meniscus, posterior horn of lateral meniscus, right knee
M23.052 - Cystic meniscus, posterior horn of lateral meniscus, left knee
M23.059 - Cystic meniscus, posterior horn of lateral meniscus, unspecified knee