Acute on chronic systolic (congestive) heart failure

This code signifies a sudden worsening or exacerbation of pre-existing, long-standing systolic heart failure. It indicates that a patient with a history of impaired left ventricular contraction is experiencing an acute decompensation, leading to more severe symptoms of heart failure.

Use this code when documentation clearly states "acute on chronic systolic heart failure" or "acute decompensated chronic systolic heart failure." This typically occurs when a patient with known chronic systolic heart failure presents with new or worsening symptoms requiring immediate medical intervention. Supporting documentation includes physician notes detailing the acute exacerbation of chronic systolic heart failure.

• Differentiate from acute systolic heart failure (I50.21) or chronic systolic heart failure (I50.22) when documentation specifies the acute-on-chronic nature.
• Ensure the medical record explicitly states both the chronic and acute components of the systolic heart failure.
• Do not code separately for chronic systolic heart failure when this code is used, as it inherently includes the chronic component.