Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
In Ischemic heart diseases (I20-I25), chapter 9: Diseases of the Circulatory System
9 billable codes under I23: 2 are an MCC, 7 are a CC; all map to HCC 229 (Unstable Angina and Other Acute Ischemic Heart Disease).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Also applies, from Ischemic heart diseases (I20-I25)
These notes sit on I20-I25 and apply to every code under it, including I23.
Code also: add a code for this too, order depends on the encounter
- the presence of hypertension (I10-I1A)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.
- Hypertension (page 50)
- Atherosclerotic Coronary Artery Disease and Angina (page 52)
- Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
- Sequelae of Cerebrovascular Disease (page 53)
- Acute myocardial infarction (AMI) (page 54)
All codes under I23
I23 can't be used on a claim. Pick a billable code below; grey headings group them.
- I23.0Hemopericardium as current complication following acute myocardial infarction
- I23.1Atrial septal defect as current complication following acute myocardial infarction
- I23.2Ventricular septal defect as current complication following acute myocardial infarction
- I23.3Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction
- I23.4Rupture of chordae tendineae as current complication following acute myocardial infarction
- I23.5Rupture of papillary muscle as current complication following acute myocardial infarction
- I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction
- I23.7Postinfarction angina
- I23.8Other current complications following acute myocardial infarction
I23 MS-DRGs
As the principal diagnosis, the billable codes under I23 group to MS-DRG 314, 315, 316, 306, or 307 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 314 Other Circulatory System Diagnoses with MCC (7 of 9 codes)
- DRG 315 Other Circulatory System Diagnoses with CC (7 of 9 codes)
- DRG 316 Other Circulatory System Diagnoses without CC/MCC (7 of 9 codes)
- DRG 306 Cardiac Congenital and Valvular Disorders with MCC (2 of 9 codes)
- DRG 307 Cardiac Congenital and Valvular Disorders without MCC (2 of 9 codes)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Heart Attack
A heart attack, also called a myocardial infarction, is a type of heart disease. It happens when blood flow to the heart suddenly becomes blocked. Without the blood coming in, the heart can't get oxygen. If not treated quickly, the heart muscle begins to die.
Read more about heart attack on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.