Question:
How is a Type 2 myocardial infarction coded in ICD-10-CM, and what additional coding considerations are required?
Answer:
Type 2 myocardial infarction is coded to ICD-10-CM code I21.A1, Myocardial infarction type 2, and requires the assignment of additional codes to identify the underlying condition responsible for the oxygen supply–demand mismatch, such as sepsis, anemia, or respiratory failure. It is important to distinguish Type 2 MI from myocardial injury because not all elevated troponin levels indicate a myocardial infarction. A diagnosis of Type 2 MI should be supported by both elevated and/or rising troponin levels and clinical evidence of myocardial ischemia, which may include symptoms, ECG changes, imaging findings, or other objective indicators.
