Myocardial infarction, acute (AMI), NOS

ICD10 Diagnosis
Dx:	Myocardial infarction, acute (AMI), NOS
ICD10 code:	I21.9
Pre-ICD10 counterpart:	Myocardial infarction
Charlson/ALERT Scale:	Myocardial infarction
APACHE Como Component:	none
APACHE Acute Component:	2019-0: Coronary Artery Disease
Start Date:
Stop Date:
External ICD10 Documentation	ICD-10 CM Wikipedia ICD-10 Wikipedia WHO ICD10 documentation ICD10data.com

This diagnosis is a part of ICD10 collection.

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  • 2019-01-01
  • 2999-12-31
  • I21.9

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Additional Info

This code is only used for an Acute Myocardial Infarction (AMI) when the more specific type is unknown(i.e. Q-wave, non-Q-wave).

MI - type vs mechanism

MIs are occasionally listed as "Type 2 MIs", ie no evidence of coronary artery disease (CAD). This refers to the mechanism, and the AMI codes include any/all mechanisms (including coronary artery embolism, thrombosis or thromboembolism); said another way, we don't particularly care about the mechanism. They should be coded based on their manifestation.

In ICD10, this will mean:

• Code the appropriate AMI code:
  • Myocardial infarction (STEMI), acute (AMI), transmural (Q-wave)
  • Myocardial infarction (NSTEMI), acute (AMI), subendocardial/non-transmural (non-Q-wave)
  • Myocardial infarction, acute (AMI), NOS
  • Past history, myocardial infarction (old MI)
• Code the cause separately, as a Combined ICD10 codes. For example it might be one of the following:
  • Coronary artery disease, chronic (atherosclerosis, chronic ischemic heart disease)
  • Ischemic heart disease, acute NOS
  • anemia - Category:Anemia
  • hypovolemia - Dehydration (volume depletion, hypovolemia)
  • Bradycardia

MI - acute vs past history

To decide whether to code an acute MI dx in the Admit Diagnosis or Acquired Diagnosis / Complication, or a Past history, myocardial infarction (old MI) in the Comorbid Diagnosis, consider the following:

• Regarding an MI that occured prior to the current hospitalization -- might be coded as either Comorbid Diagnosis, or a Past history, myocardial infarction (old MI)
• In ICD10 the code for Past history, myocardial infarction (old MI) reads as follows: Healed myocardial infarction -- Past myocardial infarction diagnosed by ECG or other special investigation, but currently presenting no symptoms.
• If the prior MI is still active and we're not dealing with any current complications of it, then instead use one of the AMI codes, as a Comorbid Diagnosis.
• If the prior MI is still active and we are dealing with any current complications of it, then instead use one of the AMI codes, as a Admit Diagnosis.
  • Examples: Papillary muscle rupture or Ongoing angina related to a recent MI prior to this unit/ward admission.
• For a missed MI: code it as one of the "...acute..." codes if the missed MI is being treated as an acute MI

Alternate ICD10s to consider coding instead or in addition

Candidate Combined ICD10 codes

• Also code any acute complications from Myocardial Infarction list.

Related CCI Codes

Data Integrity Checks (automatic list)

none found

Related Articles

Skin	Trauma Abdominal trauma Burn Chemical burn Fracture Head trauma Head trauma (old) Joint/ligament trauma Lower limb trauma Muscles/tendon trauma Neck trauma Potential trauma Thoracic trauma Traumatic Amputation Traumatic fracture Upper limb trauma Vascular trauma	Renal/urinary Chronic kidney disease Nephritic syndrome Renal failure Renal/Urinary neoplasm Urinary tract infection	Infectious disease Antibiotic resistance Bacteria COVID Double duty pathogen Encephalitis Fungus Iatrogenic infection Infection requiring pathogen Infection with implied pathogen Influenza Intra-abdominal infection Lower respiratory tract infection Meningitis Non-specific pathogens Osteomyelitis Pathogens Pneumonia Potential infection Tuberculosis Upper respiratory tract infection Virus
ENT	Testing Imaging	Cardiovascular Aneurysm Aortic Aneurysm Arrhythmia Arterial thromboembolism Atherosclerosis Cardiac septum problem Cerebral Hemorrhage/Stroke Heart valve disease Hemorrhage Hypertension Hypotension Ischemia Ischemic gut Ischemic heart disease Myocardial Infarction Pulmonary embolism Pulmonary hypertension Vasculitis Venous thromboembolism	Hereditary/congenital
Eye	Mechanism Transportation mechanism	Neoplastic Benign neoplasm Endocrine neoplasm Female genital neoplasm Gastrointestinal neoplasm Heme/immunology neoplasm Leukemia Lymphoma Male genital neoplasm Metastasis Musculoskeletal/soft tissue neoplasm Neuro neoplasm Primary malignancy Renal/Urinary neoplasm Respiratory neoplasm Skin neoplasm	Heme/immunology Allergy Anemia Heme/immunology neoplasm Hemophilia Leukemia Thrombocytopenia
Misc Adverse effect Alcohol related Allergy Anesthetic related Antidepressant related Awaiting/delayed transfer COVID Cannabis related Cocaine related Decubitus ulcer Diagnosis implying death Exposure Fistula Hallucinogen related Has one Healthcare contact Hemorrhage Iatrogenic Metabolic/nutrition Non-traumatic fracture Observation Organ removal Ostomy Overdose Paralysis Past medical history Poisoning Psychoactive substance NOS related Radiation related Retired Code Rheumatic disease Sedative related Shock Solvent related Spine Stimulant related Transplant	Reproductive Abortion Breast disease Female genital neoplasm Male genital neoplasm Peripartum	Gastrointestinal Cirrhosis GI ulcer Gastroenteritis Gastrointestinal neoplasm Hepatitis Hernia Inflammatory Bowel Disease Intra-abdominal infection Ischemic gut Liver disease Liver failure Pancreas disease Pancreatitis Peptic ulcer	Musculoskeletal/soft tissue Hernia Joint/ligament trauma Muscle problem Muscles/tendon trauma Musculoskeletal/soft tissue neoplasm Osteomyelitis
Psych Addiction Antidepressant related Delirium Dementia Hallucinogen related Opioid related Psychoactive substance NOS related Sedative related Solvent related Stimulant related Withdrawal	Respiratory Asthma Influenza Inhalation Lower respiratory tract infection Pleural abnormalities Pneumoconiosis Pneumonia Pneumothorax Pulmonary embolism Respiratory neoplasm Sleep disorder Tracheostomy Upper respiratory tract infection	Poisoning Acute intoxication Addiction Opioid related Overdose Poisoning by non-pharmaceuticals Stimulant related Withdrawal
Neuro Cerebral Hemorrhage/Stroke Encephalitis Encephalopathy Meningitis Neuro neoplasm Paralysis	Symptom/Sign Pain	Endocrine disorder Adrenal Insufficiency Diabetes Endocrine neoplasm Metabolic/nutrition

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ICD10 Categories: ANCA-associated Vasculitis (AAV), Abdominal trauma, Abortion, Acute intoxication, Addiction, Adrenal Insufficiency, Adverse effect, Alcohol related, Allergy, Anemia, Anesthetic related, Aneurysm, Antibiotic resistance, Antidepressant related, Aortic Aneurysm, Arrhythmia, Arterial thromboembolism, Asthma, Atherosclerosis, Awaiting/delayed transfer, Bacteria, Benign neoplasm, Breast disease, Burn, COVID, Cannabis related, Cardiac septum problem, Cardiovascular, Cerebral Hemorrhage/Stroke, Chemical burn, Chronic kidney disease, Cirrhosis, Cocaine related, Decubitus ulcer, Delirium, Dementia, Diabetes, Diagnosis implying death, Double duty pathogen, ENT, Encephalitis, Encephalopathy, Endocrine disorder, Endocrine neoplasm, Exposure, Eye, Female genital neoplasm, Fistula, Fracture, Fungus, GI ulcer, Gastroenteritis, Gastrointestinal, Gastrointestinal neoplasm, Hallucinogen related, Has one, Head trauma, Head trauma (old), Healthcare contact, Heart valve disease, Heme/immunology, Heme/immunology neoplasm, Hemophilia, Hemorrhage, Hepatitis, Hereditary/congenital, Hernia, Hypertension, Hypotension, Iatrogenic, Iatrogenic infection, Iatrogenic mechanism, Imaging, Infection requiring pathogen, Infection with implied pathogen, Infectious disease, Inflammatory Bowel Disease, Influenza, Inhalation, Intra-abdominal infection, Ischemia, Ischemic gut, Ischemic heart disease, Joint/ligament trauma, Leukemia, Liver disease, Liver failure, Lower limb trauma, Lower respiratory tract infection, Lymphoma, Male genital neoplasm, Mechanism, Meningitis, Metabolic/nutrition, Metastasis, Misc, Muscle problem, Muscles/tendon trauma, Musculoskeletal/soft tissue, Musculoskeletal/soft tissue neoplasm... further results