Cardiomyopathy in diseases classified elsewhere

This code represents cardiomyopathy that arises as a manifestation or complication of another underlying disease process. It signifies a heart muscle disorder where the primary etiology is a systemic condition, infectious agent, or other specific disease, rather than an idiopathic or primary cardiac issue.

Apply this code when documentation clearly links cardiomyopathy to an underlying disease that is classified elsewhere in ICD-10-CM. This requires the medical record to specify both the cardiomyopathy and the causative condition, such as metabolic disorders, neuromuscular diseases, or certain toxic exposures.

• Always sequence the underlying disease first, followed by this code, to accurately reflect the etiology.
• Review the "Excludes1" notes carefully to avoid inappropriate co-coding with specific infectious or systemic causes of cardiomyopathy that have their own dedicated codes.
• Ensure the documentation explicitly states the causal relationship between the underlying disease and the cardiomyopathy.