I21.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2026 edition of ICD-10-CM I21.4 became effective on October 1, 2025.

ICD-10 code I21.4 for Non-ST elevation (NSTEMI) myocardial infarction is a medical classification as listed by WHO under the range - Diseases of the circulatory system .

Nov 19, 2024 · Code I21.4, Non-ST elevation (NSTEMI) myocardial infarction, is used for type 1 non-ST elevation myocardial infarction (NSTEMI) and nontransmural MIs. If a type 1 NSTEMI evolves to …

Oct 1, 2024 · I21.4 is a valid billable ICD-10 diagnosis code for Non-ST elevation (NSTEMI) myocardial infarction. It is found in the 2025 version of the ICD-10 Clinical Modification (CM) and can be used in …

Jul 31, 2025 · The core ICD-10 code for NSTEMI is I21.4 – Non-ST elevation (NSTEMI) myocardial infarction. This code is used for acute, Type 1 NSTEMI events that occur within 28 days of symptom …

Aug 7, 2025 · I21.4 - Non-ST elevation (NSTEMI) myocardial infarction: This is the primary code for acute myocardial infarction without ST elevation. I21.A1 - Myocardial infarction type 2: This can …

Sep 19, 2025 · If you are managing a case of NSTEMI, you need to be familiar with the NSTEMI ICD-10 code, which is I21.4. This diagnosis code, I21.4 is pivotal not just for correct documentation but also …

The ICD-10-CM system often requires a seventh character for maximum specificity, especially for injury and external cause codes. However, for an acute myocardial infarction such as NSTEMI, I21.4 is …

Apr 16, 2021 · Non-ST elevation (NSTEMI) ICD-10 Codes for Myocardial Infarction have defined six types of MI. The two most commonly encountered are type 1 (primarily due to CAD) and type 2 …

This code is grouped under diagnosis codes for diseases of the circulatory system.