In simple words: This code describes a worsening of a long-term heart condition where the heart has trouble relaxing and filling with blood properly, leading to new or worsening heart failure symptoms.

This code signifies acute decompensation superimposed on a pre-existing chronic diastolic heart failure.Diastolic heart failure is characterized by impaired ventricular filling, often with preserved ejection fraction, leading to symptoms of heart failure despite the heart's ability to pump blood effectively.

Example 1: A 70-year-old patient with a history of hypertension and chronic diastolic heart failure is admitted to the hospital with shortness of breath, edema, and decreased exercise tolerance.The patient's condition represents an acute exacerbation of their chronic heart failure., A 65-year-old patient with known diastolic heart failure experiences a sudden onset of severe shortness of breath and chest pain.This acute decompensation requires immediate hospitalization and intervention., An 80-year-old patient with a long history of controlled diastolic heart failure presents to their physician's office with increased fatigue and swelling in their legs. While their condition is chronic, recent worsening necessitates adjustment of treatment, and I50.33 is appropriate.

Detailed history and physical examination findings, echocardiogram results (including ejection fraction), blood test results (BNP, electrolytes, creatinine), medication list, and treatment plan.

** This code should not be used for reimbursement in isolation.It's crucial to support this diagnosis with thorough clinical documentation and potentially additional codes reflecting the underlying chronic heart failure and any comorbidities.