Cystic meniscus, anterior horn of medial meniscus, unsp knee

This diagnosis code signifies the presence of a fluid-filled sac or lesion within the anterior portion of the medial meniscus in the knee. This condition can cause pain, swelling, and mechanical symptoms due to meniscal degeneration and cyst formation.

This code is appropriate when documentation specifies a cystic lesion affecting the anterior horn of the medial meniscus, and the laterality of the knee is not documented or is unknown. Supporting documentation would include imaging reports (e.g., MRI) confirming the cyst's location and a physician's diagnostic statement.

• Ensure documentation clearly specifies "anterior horn" of the medial meniscus; otherwise, a more general meniscal cyst code may be appropriate.
• If laterality (right or left knee) is documented, select the more specific code (M23.011 or M23.012).
• Do not confuse with meniscal tears (M23.2-) or other meniscal derangements without cyst formation.