Cystic meniscus, other medial meniscus, left knee

This code signifies the presence of a fluid-filled sac or cyst within the medial meniscus of the left knee. This condition can arise from meniscal degeneration or trauma, leading to localized swelling and pain.

Apply this code when documentation clearly indicates a cystic lesion affecting the medial meniscus of the left knee. This diagnosis is typically supported by imaging studies such as MRI, alongside clinical findings of knee pain and swelling localized to the medial compartment.

• Ensure laterality is accurately documented as left knee.
• Distinguish from meniscal tears without cyst formation; a separate code exists for tears.
• Verify that the cyst is specifically within the meniscal tissue, not a parameniscal cyst or other soft tissue cyst.