M23.31 - Other meniscus derangements, anterior horn of medial meniscus M23.3 - Other meniscus derangements M23.31 - Other meniscus derangements, anterior horn of medial meniscus
M23.311 - Other meniscus derangements, anterior horn of medial meniscus, right knee M23.312 - Other meniscus derangements, anterior horn of medial meniscus, left knee M23.319 - Other meniscus derangements, anterior horn of medial meniscus, unspecified knee