Cardiomyopathy due to drug and external agent

This code identifies a heart muscle disease (cardiomyopathy) that has developed as a direct consequence of exposure to a drug or other external toxic agent. It signifies a non-ischemic, non-hypertensive myocardial dysfunction caused by exogenous substances.

Apply this code when documentation clearly links cardiomyopathy to a specific medication (e.g., chemotherapy, antipsychotics) or environmental toxin. The medical record should explicitly state the causative agent and the resulting cardiac impairment.

• Always identify the specific drug or external agent responsible using an additional code from Chapter 20 (External Causes of Morbidity).
• Distinguish from other types of cardiomyopathy; ensure the etiology is clearly documented as drug/external agent-induced.
• Do not use for cardiomyopathy secondary to therapeutic drug levels unless toxicity is explicitly stated.