ICD-10 Code I50.42 – Chronic combined systolic (congestive) and diastolic (congestive) heart failure (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I50.42 – Chronic combined systolic (congestive) and diastolic (congestive) heart failure
What it is
This code identifies chronic heart failure with both systolic and diastolic dysfunction. Use it when documentation shows long-term, combined impairment of the heart’s pumping and filling ability.
Clinical signs
Common findings include exertional dyspnea, fatigue, edema, and signs of fluid overload. Clinical features vary; refer to documentation for evidence of both systolic and diastolic heart failure.
When to use this code
Use I50.42 when the provider documents chronic combined systolic and diastolic heart failure, or clearly states both components in the assessment. It is appropriate for ongoing management of established heart failure. Do not infer the combination from nonspecific “CHF” wording alone unless documentation supports it.
Do not use for
Do not use this code for isolated systolic or isolated diastolic heart failure. If the record only says heart failure or CHF without specifying both components, check documentation.
Coding tip
Look for explicit wording such as “combined systolic and diastolic heart failure” before assigning I50.42.