ICD-10-CM 2027 diagnosis code
I23Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
I23 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.Short description: Certain crnt comp fol STEMI & NSTEMI mocard infrc <= 28 day
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I23
I23 is the ICD-10-CM diagnosis code for certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period). It belongs to block I20-I25 (ischemic heart diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: I23.0 (infarction), I23.1 (infarction), I23.2 (infarction), I23.3 (infarction), I23.4 (infarction), I23.5 (infarction), I23.6 (infarction), I23.7 (angina) and 1 more.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under I23
- I23.0Hemopericardium as current complication following acute myocardial infarctionBillable
- I23.1Atrial septal defect as current complication following acute myocardial infarctionBillable
- I23.2Ventricular septal defect as current complication following acute myocardial infarctionBillable
- I23.3Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarctionBillable
- I23.4Rupture of chordae tendineae as current complication following acute myocardial infarctionBillable
- I23.5Rupture of papillary muscle as current complication following acute myocardial infarctionBillable
- I23.6Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarctionBillable
- I23.7Postinfarction anginaBillable
- I23.8Other current complications following acute myocardial infarctionBillable
Notes that apply from higher levels
Instructions written at a parent level also apply to I23.
Broader instructions also apply from I20-I25 Ischemic heart diseases and Chapter 9: Diseases of the circulatory system.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about I23
Is I23 billable?
- No. I23 is a header code. Report one of its more specific subcodes instead.