2021 ICD-10-CM Code I21

Acute myocardial infarction

Version 2021

Not Valid for Submission

I21 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of acute myocardial infarction. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:I21
Short Description:Acute myocardial infarction
Long Description:Acute myocardial infarction

Code Classification

Specific Coding for Acute myocardial infarction

Non-specific codes like I21 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for acute myocardial infarction:

  • NON-BILLABLE CODE - I21.0 for ST elevation (STEMI) myocardial infarction of anterior wall
  • BILLABLE CODE - Use I21.01 for ST elevation (STEMI) myocardial infarction involving left main coronary artery
  • BILLABLE CODE - Use I21.02 for ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
  • BILLABLE CODE - Use I21.09 for ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
  • NON-BILLABLE CODE - I21.1 for ST elevation (STEMI) myocardial infarction of inferior wall
  • BILLABLE CODE - Use I21.11 for ST elevation (STEMI) myocardial infarction involving right coronary artery
  • BILLABLE CODE - Use I21.19 for ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
  • NON-BILLABLE CODE - I21.2 for ST elevation (STEMI) myocardial infarction of other sites
  • BILLABLE CODE - Use I21.21 for ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
  • BILLABLE CODE - Use I21.29 for ST elevation (STEMI) myocardial infarction involving other sites
  • BILLABLE CODE - Use I21.3 for ST elevation (STEMI) myocardial infarction of unspecified site
  • BILLABLE CODE - Use I21.4 for Non-ST elevation (NSTEMI) myocardial infarction
  • BILLABLE CODE - Use I21.9 for Acute myocardial infarction, unspecified
  • NON-BILLABLE CODE - I21.A for Other type of myocardial infarction
  • BILLABLE CODE - Use I21.A1 for Myocardial infarction type 2
  • BILLABLE CODE - Use I21.A9 for Other myocardial infarction type

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code I21:


Includes

Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

Use Additional Code

Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

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

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


[Learn More in MedlinePlus]

Code History

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