Cardiomyopathy in other diseases classified elsewhere

This code represents a form of heart muscle disease (cardiomyopathy) that develops as a manifestation or complication of another underlying systemic disease. It indicates that the primary pathology is not intrinsic to the heart but rather a consequence of a separate, identifiable medical condition affecting other body systems. Examples include cardiomyopathy secondary to endocrine disorders, neuromuscular diseases, or nutritional deficiencies.

Use this code when documentation clearly links cardiomyopathy to an underlying systemic disease classified elsewhere, and the cardiomyopathy is not specified as alcoholic, metabolic, or due to a toxic agent. The medical record should explicitly state the causal relationship between the systemic disease and the cardiomyopathy. This code is appropriate when the cardiomyopathy is a significant clinical finding requiring management.

• Always sequence the underlying systemic disease first, followed by this code to show the causal relationship.
• Do not use this code for cardiomyopathies specifically classified elsewhere, such as alcoholic cardiomyopathy (425.5) or metabolic cardiomyopathy (425.6).
• Ensure the physician's documentation clearly establishes the "due to" or "secondary to" link between the systemic disease and the cardiomyopathy.