1. ICD-10-CM Codes
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2. I00-I99
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3. I20-I25
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4. I21-
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5. 2023 ICD-10-CM Diagnosis Code I21

2023 ICD-10-CM Diagnosis Code I21

Acute myocardial infarction

2016 2017 2018 - Revised Code 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

• I21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• The 2023 edition of ICD-10-CM I21 became effective on October 1, 2022.
• This is the American ICD-10-CM version of I21 - other international versions of ICD-10 I21 may differ.

• A disorder characterized by gross necrosis of the myocardium; this is due to an interruption of blood supply to the area.
• Coagulation of blood in any of the coronary vessels. The presence of a blood clot (thrombus) often leads to myocardial infarction.
• Complete blockage of blood flow through one of the coronary arteries, usually from coronary atherosclerosis.
• Each year over a million people in the United States 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.
• Gross necrosis of the myocardium, as a result of interruption of the blood supply to the area, as in coronary thrombosis.
• Gross necrosis of the myocardium, as a result of interruption of the blood supply to the area.
• Necrosis of the myocardium caused by an obstruction of the blood supply to the heart (coronary circulation).
• Necrosis of the myocardium, as a result of interruption of the blood supply to the area. It is characterized by a severe and rapid onset of symptoms that may include chest pain, often radiating to the left arm and left side of the neck, dyspnea, sweating, and palpitations.

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): Revised code
  • New description: Acute myocardial infarction
  • 2017 description: ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Code First: Z92.82
  ICD-10-CM Diagnosis Code Z92.82

  Status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt

  Code First

  • condition requiring tPA administration, such as:
  • acute cerebral infarction (I63.-)
  • acute myocardial infarction (I21.-, I22.-)
• Type 1 Excludes: I5A
  ICD-10-CM Diagnosis Code I5A

  Non-ischemic myocardial injury (non-traumatic)

  2022 - New Code 2023 Billable/Specific Code

  Applicable To

  • Acute (non-ischemic) myocardial injury
  • Chronic (non-ischemic) myocardial injury
  • Unspecified (non-ischemic) myocardial injury

  Code First

  • the underlying cause, if known and applicable, such as:
  • acute kidney failure (N17.-)
  • acute myocarditis (I40.-)
  • cardiomyopathy (I42.-)
  • chronic kidney disease (CKD) (N18.-)
  • heart failure (I50.-)
  • hypertensive urgency (I16.0)
  • nonrheumatic aortic valve disorders (I35.-)
  • paroxysmal tachycardia (I47.-)
  • pulmonary embolism (I26.-)
  • pulmonary hypertension (I27.0, I27.2-)
  • sepsis (A41.-)
  • takotsubo syndrome (I51.81)

  Type 1 Excludes

  • acute myocardial infarction (I21.-)
  • injury of heart (S26.-)

  Type 2 Excludes

  • other acute ischemic heart diseases (I24.-)

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.