ICD-10 Code I45.9 – Conduction disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I45.9 – Conduction disorder, unspecified
What it is
I45.9 identifies a disorder of the heart’s electrical conduction system when the specific type is not documented. Use it when the record confirms a conduction problem but does not name a more precise arrhythmia or block.
Clinical signs
Clinical features vary; refer to documentation. Patients may have an abnormal ECG, irregular pulse, dizziness, syncope, or palpitations, but the exact finding should be stated in the chart.
When to use this code
Use this code when the provider documents “conduction disorder” without further detail, or when the abnormal conduction finding is present but unspecified. It is appropriate only when you cannot code a more specific conduction abnormality from the record.
Do not use for
Do not use I45.9 if the documentation identifies a specific conduction defect, such as atrioventricular block or bundle branch block. Check documentation before defaulting to this unspecified code.
Coding tip
Look for the exact ECG or provider wording first; unspecified codes are a fallback when no more specific conduction diagnosis is documented.