ICD-10 Code I50.9 – Heart failure, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I50.9 – Heart failure, unspecified
What it is
I50.9 is used when the record documents heart failure, but does not specify the type or whether it is acute or chronic. It tells you the patient has heart failure without further detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include shortness of breath, fatigue, edema, and signs of fluid retention, but the specific pattern is not stated in this code.
When to use this code
Use I50.9 when the provider clearly documents heart failure and no more specific type is available in the note or report. It is appropriate when the record lacks detail needed for a more specific heart failure code. If the chart later specifies acute, chronic, systolic, or diastolic heart failure, code that documented condition instead.
Do not use for
Do not use I50.9 when the documentation identifies a more specific heart failure type. Do not use it for symptoms alone, such as dyspnea or edema, without a documented diagnosis of heart failure.
Coding tip
Query for clarification when heart failure is documented but the type, acuity, or laterality-equivalent detail is missing.