ICD-10-CM > M00-M99 > M20-M25 > M23 > M23.0 > M23.04 M23.04 Cystic meniscus, anterior horn of lateral meniscus Non-Billable/Non-Specific Codes M23.041Cystic meniscus, anterior horn of lateral meniscus, right kneeM23.042Cystic meniscus, anterior horn of lateral meniscus, left kneeM23.049Cystic meniscus, anterior horn of lateral meniscus, unspecified knee