ICD-10 Code I23.6 – Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I23.6 – Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
What it is
I23.6 identifies a clot in the atrium, auricular appendage, or ventricle that is a current complication after an acute myocardial infarction. Use it when the record links the thrombosis directly to the recent heart attack.
Clinical signs
Clinical features vary; refer to documentation. Supporting evidence may include imaging, echocardiography, or other cardiac evaluation showing intracardiac thrombus after acute MI.
When to use this code
Use I23.6 when the provider documents intracardiac thrombosis as a current complication of an acute myocardial infarction. The note should connect the thrombus to the post-infarction state, not simply mention a history of MI. If the relationship is unclear, check documentation.
Do not use for
Do not use this code for thrombus unrelated to an acute myocardial infarction or for a past MI without a current complication. Do not assign it when the chart does not specify atrium, auricular appendage, or ventricle thrombosis.
Coding tip
Confirm the provider states both the acute MI linkage and the specific intracardiac site before coding I23.6.