ICD-10 Code I50.31 – Acute diastolic (congestive) heart failure (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I50.31 – Acute diastolic (congestive) heart failure
What it is
This code identifies an acute episode of heart failure with diastolic dysfunction, where the heart does not relax or fill properly. It is used when the provider documents acute diastolic or acute congestive heart failure with diastolic features.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include shortness of breath, fluid overload, pulmonary congestion, or other signs of acute heart failure. Use only when the record supports a diastolic type.
When to use this code
Use I50.31 when the provider clearly documents acute diastolic heart failure, or acute congestive heart failure with diastolic dysfunction. Choose this code when the episode is acute and the chart supports heart failure due to impaired filling rather than reduced systolic function.
Do not use for
Do not use it for chronic diastolic heart failure without an acute episode. Check documentation if the record instead describes systolic, combined, or unspecified heart failure.
Coding tip
Code the documented heart failure type exactly as stated, and query if acute diastolic versus another heart failure category is unclear.