Is I21.21 a billable code?
Yes. I21.21 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
I21.21: ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
Billable codeValid for dates of service October 1, 2026 to September 30, 2027
I21.21 is a billable ICD-10-CM diagnosis code for st elevation (stemi) myocardial infarction involving left circumflex coronary artery. It is specific enough to use on an insurance claim, a superbill or a Good Faith Estimate.
Superbill GeneratorStart a superbill with I21.21 already added.Good Faith EstimateStart a cost estimate with I21.21 already added.CMS-1500 Claim FormFill a claim form with I21.21 in box 21.
Other codes in I21.2 ST elevation (STEMI) myocardial infarction of other sites
I21.21 questions
What does I21.21 mean?
I21.21 is the ICD-10-CM code for ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery. 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.