ICD-10 Code I50.40 – Unspecified combined systolic (congestive) and diastolic (congestive) heart failure (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I50.40 – Unspecified combined systolic (congestive) and diastolic (congestive) heart failure
What it is
This code identifies heart failure with both systolic and diastolic components, but the record does not specify whether the condition is acute, chronic, or acute on chronic. Use it when documentation confirms combined heart failure without further detail.
Clinical signs
Common findings include dyspnea, fatigue, edema, and signs of fluid overload. Clinical features vary; refer to documentation, and code only when the provider clearly identifies combined systolic and diastolic heart failure.
When to use this code
Use I50.40 when the provider documents combined systolic and diastolic heart failure and does not state a more specific acuity or type. It may appear in discharge summaries, problem lists, or assessment notes. If the record specifies acute, chronic, or acute on chronic, choose the more specific code.
Do not use for
Do not use this code for isolated systolic or isolated diastolic heart failure, or when the documentation only says congestive heart failure without combined features. Check documentation if the type or acuity is unclear.
Coding tip
Code the highest level of specificity documented, and query for acuity if the note confirms heart failure but does not define it.