Final answer:
Codes for subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (MI) are reported based on evidence from the patient's ECG and blood tests.
Step-by-step explanation:
Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (MI) codes are reported when there is evidence of an acute MI based on the patient's ECG and blood tests.
ST-elevated MI (STEMI) is diagnosed when there is an elevation of the ST segment above the baseline in the ECG, which often indicates an acute MI. Non-ST elevation MI (NSTEMI) is diagnosed when there is no elevation of the ST segment, but other evidence such as symptoms and cardiac enzyme levels suggest an acute MI.
Some common blood tests that indicate an MI include elevated levels of creatine kinase MB (CK-MB) and cardiac troponin, which are released by damaged cardiac muscle cells.