ICD-10 Code I45.5 – Other specified heart block (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I45.5 – Other specified heart block
What it is
I45.5 identifies a heart block that does not fit a more specific ICD-10 category. Use it for documented conduction delay or block when the record names a specific “other” type.
Clinical signs
Clinical features vary; refer to documentation. Findings may include abnormal atrioventricular conduction on ECG, such as delayed or intermittent impulse transmission between atria and ventricles.
When to use this code
Use this code when the provider documents an “other specified” heart block and does not assign a more precise conduction disorder. It may apply when the type is named in the chart but lacks a dedicated ICD-10 code.
Check the note for the exact rhythm diagnosis, because unspecified bradycardia or generic conduction abnormality may require a different code. Capture any documented relationship to underlying cardiac disease if stated.
Do not use for
Do not use I45.5 for complete atrioventricular block, left or right bundle-branch block, or nonspecific heart block when a more specific code is documented. Check documentation.
Coding tip
Code the most specific conduction disorder named by the provider, and query if “other specified” is unclear.