ICD-10 Diagnosis Code I21.3

ST elevation (STEMI) myocardial infarction of unsp site

Diagnosis Code I21.3

ICD-10: I21.3
Short Description: ST elevation (STEMI) myocardial infarction of unsp site
Long Description: ST elevation (STEMI) myocardial infarction of unspecified site
This is the 2017 version of the ICD-10-CM diagnosis code I21.3

Valid for Submission
The code I21.3 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the circulatory system (I00–I99)
    • Ischemic heart diseases (I20-I25)
      • STEMI & NSTEMI mocard infrc (I21)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code I21.3 is grouped in the following Diagnostic Related Group(s) (MS-DRG V34.0)

  • 222 - CARDIAC DEFIBRILLATOR IMPLANT WITH CARDIAC CATHETERIZATION WITH AMI/HF/SHOCK WITH MCC
  • 223 - CARDIAC DEFIBRILLATOR IMPLANT WITH CARDIAC CATHETERIZATION WITH AMI/HF/SHOCK WITHOUT MCC
  • 224 - CARDIAC DEFIBRILLATOR IMPLANT WITH CARDIAC CATHETERIZATION WITHOUT AMI/HF/SHOCK WITH MCC
  • 225 - CARDIAC DEFIBRILLATOR IMPLANT WITH CARDIAC CATHETERIZATION WITHOUT AMI/HF/SHOCK WITHOUT MCC
  • 226 - CARDIAC DEFIBRILLATOR IMPLANT WITHOUT CARDIAC CATHETERATION WITH MCC
  • 227 - CARDIAC DEFIBRILLATOR IMPLANT WITHOUT CARDIAC CATHETERIZATION WITHOUT MCC

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

Synonyms
  • Acute infarction of papillary muscle
  • Acute myocardial infarction
  • Acute myocardial infarction due to left coronary artery occlusion
  • Acute myocardial infarction during procedure
  • Acute myocardial infarction with rupture of ventricle
  • Acute Q wave infarction - widespread
  • Acute Q wave myocardial infarction
  • Acute ST segment elevation myocardial infarction
  • Acute widespread myocardial infarction
  • Coronary artery embolism
  • Coronary artery rupture
  • Drug-related myocardial necrosis syndrome
  • Electrocardiographic myocardial infarction
  • First myocardial infarction
  • Left coronary artery occlusion
  • Mitral valve regurgitation due to acute myocardial infarction
  • Mitral valve regurgitation due to acute myocardial infarction
  • Mitral valve regurgitation due to acute myocardial infarction with papillary muscle and chordal rupture
  • Mitral valve regurgitation due to acute myocardial infarction without papillary muscle and chordal rupture
  • Mixed myocardial ischemia and infarction
  • Mural thrombus of heart
  • Myocardial infarction
  • Myocardial infarction in recovery phase
  • Myocardial infarction with complication
  • Myocardial ischemia
  • Pericarditis secondary to acute myocardial infarction
  • Postoperative myocardial infarction
  • Right coronary artery occlusion
  • Rupture of heart

Index of Diseases and Injuries
References found for the code I21.3 in the Index of Diseases and Injuries:


Information for Patients


Heart Attack

Also called: MI, Myocardial infarction

Each year over a million people in the U.S. have a heart attack. About half of them die. Many people have permanent heart damage or die because they don't get help immediately. It's important to know the symptoms of a heart attack and call 9-1-1 if someone is having them. Those symptoms include

  • Chest discomfort - pressure, squeezing, or pain
  • Shortness of breath
  • Discomfort in the upper body - arms, shoulder, neck, back
  • Nausea, vomiting, dizziness, lightheadedness, sweating

These symptoms can sometimes be different in women.

What exactly is a heart attack? Most heart attacks happen when a clot in the coronary artery blocks the supply of blood and oxygen to the heart. Often this leads to an irregular heartbeat - called an arrhythmia - that causes a severe decrease in the pumping function of the heart. A blockage that is not treated within a few hours causes the affected heart muscle to die.

NIH: National Heart, Lung, and Blood Institute

  • Being active after your heart attack
  • Cardiac catheterization
  • Cardiac catheterization - discharge
  • Heart attack
  • Heart attack - discharge
  • Learn What a Heart Attack Feels Like--It Could Save Your Life - NIH - Easy-to-Read (National Heart, Lung, and Blood Institute)
  • Talk With Your Health Care Provider About Taking Aspirin to Prevent Heart Attack (Agency for Healthcare Research and Quality)
  • Troponin test


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