Specific code icon 2014 ICD-10-CM Diagnosis Code I21.4

Non-ST elevation (NSTEMI) myocardial infarction

  • I21.4 is a billable ICD-10-CM code that can be used to specify a diagnosis.
  • On October 1, 2014 ICD-10-CM will replace ICD-9-CM in the United States, therefore, I21.4 and all other ICD-10-CM codes should only be used for training or planning purposes until then.
Clinical Information
  • A myocardial infarction in the absence of observable q wave abnormalities in the ecg.
Applicable To
  • Acute subendocardial myocardial infarction
  • Non-Q wave myocardial infarction NOS
  • Nontransmural myocardial infarction NOS
Description Synonyms
  • Acute non ST elevation MI
  • Acute non-ST segment elevation myocardial infarction
  • Heart attack
  • MI, acute, non ST segment elevation
Mortality Data
  • Between 1999-2007 there were 2,212 deaths in the United States where ICD-10 I21.4 was indicated as the underlying cause of death [source: cdc.govlink to cdc.gov]
  • ICD-10 I21.4 as underlying cause of death data broken down by: gender, age, race, year
ICD-10-CM I21.4 is grouped within Diagnostic Related Group(s) (MS-DRG v30.0):
  • 222 Cardiac defib implant with cardiac cath with ami/hf/shock with mcc
  • 223 Cardiac defib implant with cardiac cath with ami/hf/shock without mcc
  • 224 Cardiac defib implant with cardiac cath without ami/hf/shock with mcc
  • 225 Cardiac defib implant with cardiac cath without ami/hf/shock without mcc
  • 226 Cardiac defibrillator implant without cardiac cath with mcc
  • 227 Cardiac defibrillator implant without cardiac cath without mcc
  • 280 Acute myocardial infarction, discharged alive with mcc
  • 281 Acute myocardial infarction, discharged alive with cc
  • 282 Acute myocardial infarction, discharged alive without cc/mcc
  • 283 Acute myocardial infarction, expired with mcc
  • 284 Acute myocardial infarction, expired with cc
  • 285 Acute myocardial infarction, expired without cc/mcc
Convert ICD-10-CM I21.4 to ICD-9-CM
The following ICD-10-CM Index entries contain back-references to ICD-10-CM I21.4: