Cystic meniscus, anterior horn of lat mensc, unsp knee

This diagnosis code signifies the presence of a cystic lesion within the anterior horn of the lateral meniscus in an unspecified knee. A meniscal cyst is typically a benign, fluid-filled sac that forms adjacent to or within a meniscal tear, often presenting as a palpable mass.

Apply this code when documentation explicitly states a cystic meniscus affecting the anterior horn of the lateral meniscus, and the laterality of the knee (right or left) is not specified. This is commonly seen in imaging reports (MRI) or operative notes where the exact knee is not documented.

• Ensure documentation specifies "anterior horn" and "lateral meniscus" to differentiate from other meniscal locations.
• Avoid using this code if the laterality of the knee (right or left) is clearly documented; instead, select the more specific M23.041 (right) or M23.042 (left).
• This code does not inherently imply a meniscal tear, though cysts are often associated with them. Code any co-occurring meniscal tear separately if documented.