Other heart disorders in diseases classified elsewhere

This code represents cardiac conditions that are secondary manifestations of another underlying systemic disease, where the heart disorder itself is not specifically classified elsewhere. It signifies heart involvement directly attributable to an external or systemic cause, rather than a primary cardiac pathology.

Use this code when documentation clearly links a heart disorder to an underlying systemic disease that has its own specific ICD-10-CM code. This is a "manifestation" code, meaning it should always be sequenced after the code for the underlying disease. Examples include cardiac involvement in metabolic disorders, certain infectious diseases (not specifically excluded), or toxic effects.

• Always sequence this code after the code for the underlying systemic disease.
• Review the "Excludes1" notes carefully to avoid inappropriate co-reporting with specific infectious or autoimmune heart conditions.
• Ensure the provider's documentation explicitly states the heart disorder is a manifestation of, or due to, the underlying condition.