Specific code icon 2016/17 ICD-10-CM Diagnosis Code I21.4

Non-ST elevation (NSTEMI) myocardial infarction

    2016 2017 Billable/Specific Code

  • I21.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • This is the American ICD-10-CM version of I21.4. Other international versions of ICD-10 I21.4 may differ.
  • Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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
Approximate Synonyms
  • Acute non ST elevation MI
  • Acute non-ST segment elevation myocardial infarction
  • Heart attack
  • MI, acute, non ST segment elevation
ICD-10-CM I21.4 is grouped within 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
  • 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: