ICD-10 Code I50.3 – Diastolic (congestive) heart failure (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I50.3 – Diastolic (congestive) heart failure
What it is
I50.3 identifies heart failure with preserved pumping function but impaired relaxation and filling of the left ventricle. Use it when the record specifically documents diastolic or preserved-ejection-fraction heart failure.
Clinical signs
Common findings include dyspnea, exercise intolerance, edema, and signs of fluid overload. Clinical features vary; refer to documentation for whether the provider attributes the presentation to diastolic heart failure.
When to use this code
Use I50.3 when the provider diagnoses diastolic heart failure, including “congestive” or “HFpEF” if documented that way. It may appear in inpatient, outpatient, or problem-list documentation when the condition is active or being evaluated.
If the note only says “heart failure” without specifying systolic or diastolic type, check documentation before coding. If the record identifies mixed or combined heart failure, do not assume I50.3.
Do not use for
Do not use this code for systolic heart failure, combined heart failure, or nonspecific heart failure without documentation of diastolic involvement. Check documentation if the provider uses abbreviations or uncertain wording.
Coding tip
Assign the code only when the documentation clearly supports diastolic heart failure, and query for type when the record is ambiguous.