ICD-10-CM Coding Practice Exam 2025 – Your All-in-One Resource to Master Medical Coding!

The correct code for type 1 non-ST elevation myocardial infarction (NSTEMI) is I21.4. This code specifically represents a non-ST elevation myocardial infarction, which is characterized by elevated cardiac biomarkers and evidence of myocardial injury in the absence of ST elevation on an electrocardiogram (ECG).

Type 1 NSTEMI refers to myocardial infarction due to a coronary occlusion, typically resulting from atherosclerosis or plaque rupture. The ICD-10-CM coding system categorizes cardiac events based on their presentation, with distinct codes assigned to different types of myocardial infarctions to ensure accurate documentation, treatment, and statistical reporting.

The other options correspond to different conditions: I21.9 represents an unspecified type of myocardial infarction, I21.3 is for ST elevation myocardial infarction, and I25.2 denotes atherosclerotic heart disease. Understanding the distinctions between these codes is critical for proper coding to reflect the patient's diagnosis accurately.