Question: What diagnosis code should I use for arterial thrombosis? Answer: You should report 411.81 (Acute coronary occlusion without myocardial infarction) without myocardial infarction and 429.79 (Certain sequelae of myocardial infarction, not elsewhere classified; other) following a myocardial infarction.
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Note: Arterial thrombosis is another way of describing coronary vessel occlusion or partial occlusion due to thrombus (clot) formation. This condition often leads to unstable angina on one end of the spectrum and myocardial infarction on the other end.