2024 ICD-10-CM Diagnosis Code I21.B

Myocardial infarction with coronary microvascular dysfunction

• I21.B is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Myocardial infarction with coronary microvascular dysfnct
• ICD-10-CM I21.B is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of I21.B – other international versions of ICD-10 I21.B may differ.

Applicable To

• Myocardial infarction with coronary microvascular disease
• Myocardial infarction with nonobstructive coronary arteries [MINOCA] with microvascular disease

The following code(s) above I21.B contain annotation back-references

 that may be applicable to I21.B:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I21  Acute myocardial infarction

ICD-10-CM I21.B is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 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

Code History

• 2024 (effective 10/1/2023): New code

Code annotations containing back-references to I21.B:

• Type 1 Excludes: I25.82

Diagnosis Index entries containing back-references to I21.B:

• Disease, diseased – see also Syndrome
  • coronary (artery) – see Disease, heart, ischemic, atherosclerotic
    • microvascular
      • with
        • myocardial infarction I21.B
• Dysfunction
  • coronary microvascularI25.85
    • with
      • myocardial infarction I21.B
• Infarct, infarction
  • myocardium, myocardial (acute) (with stated duration of 4 weeks or less) I21.9
    • with
      • coronary microvascular disease I21.B
      • coronary microvascular dysfunction I21.B
      • nonobstructive coronary arteries [MINOCA] with microvascular disease I21.B