Postmastectomy lymphedema syndrome

This code represents the development of lymphedema in the arm, breast, or trunk following a mastectomy procedure. It is characterized by chronic swelling due to impaired lymphatic drainage, often accompanied by pain, heaviness, and restricted range of motion. This condition is a common long-term complication of breast cancer treatment involving lymph node dissection.

Use this code when documentation clearly indicates lymphedema occurring as a direct consequence of a mastectomy. This includes cases where the lymphedema manifests months or years after the initial surgery. Supporting documentation should specify the laterality of the lymphedema and its association with the prior mastectomy.

• Always specify laterality (e.g., left, right, bilateral) if documented, using a more specific subcategory if available.
• Do not confuse with lymphedema due to other causes; ensure the documentation explicitly links it to a mastectomy.
• Sequence this code after the primary malignancy code if the patient is still undergoing active cancer treatment or surveillance.