Chronic lung allograft dysfunction, unspecified

This code represents a general diagnosis of chronic deterioration of lung function in a patient who has undergone a lung transplant. It signifies a persistent decline in allograft function that is not otherwise specified as a particular type of chronic lung allograft dysfunction (e.g., bronchiolitis obliterans syndrome, restrictive allograft syndrome).

Use this code when documentation indicates chronic lung allograft dysfunction without further specification of the type or underlying cause. This is an appropriate code when the physician's diagnosis is simply "chronic lung allograft dysfunction" or "CLAD, unspecified." It should be supported by clinical findings consistent with chronic allograft rejection, such as progressive decline in pulmonary function tests.

• Avoid using this code if a more specific type of chronic lung allograft dysfunction (e.g., J4A.0-J4A.8) is documented.
• Always review the medical record for specific details regarding the type of allograft dysfunction before assigning this unspecified code.
• Consider sequencing this code after a code for the lung transplant status (e.g., Z94.2) if applicable.