ICD-10-CM Code I23

Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

Version 2021 Non-Billable Code

Not Valid for Submission

I23 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of certain current complications following st elevation (stemi) and non-st elevation (nstemi) myocardial infarction (within the 28 day period). The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions.

ICD-10:I23
Short Description:Certain crnt comp fol STEMI & NSTEMI mocard infrc <= 28 day
Long Description:Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

Consider the following ICD-10 codes with a higher level of specificity:

  • I23.0 - Hemopericardium as current complication following acute myocardial infarction
  • I23.1 - Atrial septal defect as current complication following acute myocardial infarction
  • I23.2 - Ventricular septal defect as current complication following acute myocardial infarction
  • I23.3 - Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction
  • I23.4 - Rupture of chordae tendineae as current complication following acute myocardial infarction
  • I23.5 - Rupture of papillary muscle as current complication following acute myocardial infarction
  • I23.6 - Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
  • I23.7 - Postinfarction angina
  • I23.8 - Other current complications following acute myocardial infarction

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Ischemic heart diseases (I20-I25)
      • Certain crnt comp fol STEMI & NSTEMI mocard infrc <= 28 day (I23)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Heart Attack

Also called: MI, Myocardial infarction

Each year almost 800,000 Americans have a heart attack. A heart attack happens when blood flow to the heart suddenly becomes blocked. Without the blood coming in, the heart can't get oxygen. If not treated quickly, the heart muscle begins to die. But if you do get quick treatment, you may be able to prevent or limit damage to the heart muscle. That's why it's important to know the symptoms of a heart attack and call 911 if you or someone else is having them. You should call, even if you are not sure that it is a heart attack.

The most common symptoms in men and women are

  • Chest discomfort. It is often in center or left side of the chest. It usually lasts more than a few minutes. It may go away and come back. It can feel like pressure, squeezing, fullness, or pain. It also can feel like heartburn or indigestion.
  • Shortness of breath. Sometimes this is your only symptom. You may get it before or during the chest discomfort. It can happen when you are resting or doing a little bit of physical activity.
  • Discomfort in the upper body. You may feel pain or discomfort in one or both arms, the back, shoulders, neck, jaw, or upper part of the stomach.

You may also have other symptoms, such as nausea, vomiting, dizziness, and lightheadedness. You may break out in a cold sweat. Sometimes women will have different symptoms then men. For example, they are more likely to feel tired for no reason.

The most common cause of heart attacks is coronary artery disease (CAD). With CAD, there is a buildup of cholesterol and other material, called plaque, on their inner walls or the arteries. This is atherosclerosis. It can build up for years. Eventually an area of plaque can rupture (break open). A blood clot can form around the plaque and block the artery.

A less common cause of heart attack is a severe spasm (tightening) of a coronary artery. The spasm cuts off blood flow through the artery.

At the hospital, health care providers make a diagnosis based on your symptoms, blood tests, and different heart health tests. Treatments may include medicines and medical procedures such as coronary angioplasty. After a heart attack, cardiac rehabilitation and lifestyle changes can help you recover.

NIH: National Heart, Lung, and Blood Institute

  • Being active after your heart attack (Medical Encyclopedia)
  • Cardiac catheterization - discharge (Medical Encyclopedia)
  • Heart attack (Medical Encyclopedia)
  • Heart attack - discharge (Medical Encyclopedia)
  • Learn What a Heart Attack Feels Like--It Could Save Your Life - NIH - Easy-to-Read (National Heart, Lung, and Blood Institute)
  • Troponin test (Medical Encyclopedia)

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