I23.6
BillableThrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
HCC Category Mapping
V28HCC 229 — Unstable Angina and Other Acute Ischemic Heart Disease
0.000V24HCC 87 — Unstable Angina and Other Acute Ischemic Heart Disease
0.274ESRDHCC 87 — Unstable Angina and Other Acute Ischemic Heart Disease
0.000RxHCCHCC 188 — Coronary Artery Disease and Angina
0.000What This Code Means
Blood clots forming in the heart chambers or upper heart chambers as a complication occurring right after a heart attack.
Coding Tips
- •This code is only used during the acute phase following MI (typically within 4 weeks); verify the temporal relationship to the initial MI
- •Specify the location of thrombosis (atrium, auricular appendage, or ventricle) when documented
Clinical Significance
Intracardiac thrombosis following acute myocardial infarction occurs when blood clots form in the heart chambers due to endocardial injury, blood stasis, and hypercoagulability — the components of Virchow's triad. Left ventricular thrombus is most common, particularly after anterior wall myocardial infarction with reduced ejection fraction. These thrombi carry significant risk of systemic embolization including stroke.
Documentation Requirements
- ✓Documentation of intracardiac thrombosis as a complication of acute myocardial infarction
- ✓Imaging confirmation (echocardiogram, cardiac magnetic resonance imaging) showing the thrombus
- ✓Location specified (left ventricular, left atrial, right atrial, or auricular appendage)
- ✓Temporal relationship to the acute myocardial infarction
- ✓The underlying acute myocardial infarction coded separately (I21.x)
- ✓Anticoagulation therapy documented
Excludes 1 — Do NOT code together
- thrombosis of atrium, auricular appendage, and ventricle not specified as current complication following acute myocardial infarction (I51.3)
Commonly Confused Codes
I82.290 — Acute embolism and thrombosis of other veins: venous thrombosis, not intracardiacI23.8 — Other current complications following acute myocardial infarction: less specificI51.3 — Intracardiac thrombosis, not elsewhere classified: for intracardiac thrombus not related to acute myocardial infarctionI23.0 — Hemopericardium following acute myocardial infarction: different complication
Code Hierarchy
└I23Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)└I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
└I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction