Is I21.B a billable code?
Yes. I21.B is a billable ICD-10-CM code and can be used on claims and superbills for dates of service from October 1, 2026 to September 30, 2027.
ICD-10-CM FY2027 diagnosis code
I21.B: Myocardial infarction with coronary microvascular dysfunction
Billable codeValid for dates of service October 1, 2026 to September 30, 2027
I21.B is a billable ICD-10-CM diagnosis code for myocardial infarction with coronary microvascular dysfunction. It is specific enough to use on an insurance claim, a superbill or a Good Faith Estimate.
Superbill GeneratorStart a superbill with I21.B already added.Good Faith EstimateStart a cost estimate with I21.B already added.CMS-1500 Claim FormFill a claim form with I21.B in box 21.
Other codes in I21 Acute myocardial infarction
- I21.0ST elevation (STEMI) myocardial infarction of anterior wallheader
- I21.1ST elevation (STEMI) myocardial infarction of inferior wallheader
- I21.2ST elevation (STEMI) myocardial infarction of other sitesheader
- I21.3ST elevation (STEMI) myocardial infarction of unspecified site
- I21.4Non-ST elevation (NSTEMI) myocardial infarction
- I21.9Acute myocardial infarction, unspecified
- I21.AOther type of myocardial infarctionheader
I21.B questions
What does I21.B mean?
I21.B is the ICD-10-CM code for Myocardial infarction with coronary microvascular dysfunction. It is in chapter 9, Diseases of the circulatory system (I00-I99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.