ICD-10 Code I45.6 – Pre-excitation syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I45.6 – Pre-excitation syndrome
What it is
Pre-excitation syndrome is a cardiac conduction disorder in which an extra electrical pathway allows impulses to reach the ventricles early. This can produce characteristic ECG findings and may be associated with episodes of tachycardia.
Clinical signs
Typical documentation includes a short PR interval and evidence of ventricular pre-excitation, often with a delta wave on ECG. Clinical features vary; refer to documentation.
When to use this code
Use I45.6 when the provider documents pre-excitation syndrome, Wolff-Parkinson-White pattern, or another confirmed pre-excitation disorder. Code it when the condition is established by ECG or clearly stated in the record, even if the encounter is for monitoring or evaluation.
Do not use for
Do not use this code for nonspecific palpitations, isolated tachycardia, or abnormal ECG findings without documented pre-excitation. Check documentation if the record only mentions suspected accessory pathway.
Coding tip
Assign I45.6 only when pre-excitation is explicitly documented or clearly supported by the ECG interpretation.