ICD-10 Code I45.8 – Other specified conduction disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I45.8 – Other specified conduction disorders
What it is
I45.8 identifies a heart conduction problem that does not fit a more specific ICD-10 category. Use it when the provider documents an atypical or specified conduction disorder and no other code is appropriate.
Clinical signs
Findings may include abnormal cardiac conduction on ECG, such as delayed or interrupted impulse transmission. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states a conduction disorder, but not first-degree, second-degree, third-degree, bundle branch, or other listed conduction diagnoses. It is appropriate for documented “other specified” conduction abnormalities when the exact type is not separately coded.
Do not use for
Do not use I45.8 when a more specific conduction disorder is documented, such as atrioventricular block or bundle branch block. Check documentation if the rhythm issue is actually a nonspecific arrhythmia instead.
Coding tip
Code the most specific conduction diagnosis documented, and query the provider if the wording is vague.