Does ICD-10 code I23 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code I23: Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

Name: ICD-10 Code I23: Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:12:41.946Z

I23 is an ICD-10 diagnosis entry used to group records related to Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period). You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

May be used when a clinician documents certain current complications following st elevation (stemi) and non-st elevation (nstemi) myocardial infarction (within the 28 day period) in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

9Diseases of the circulatory system (I00-I99)

block

I20-I25Ischemic heart diseases

currentI20-I25

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

CardiologistGeneral Physician

Sibling codes

I20Angina pectoris I21Acute myocardial infarction I22Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction I24Other acute ischemic heart diseases I25Chronic ischemic heart disease

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

I23

Replacement codes

I23.0 — Hemopericardium as current complication following acute myocardial infarctionI23.1 — Atrial septal defect as current complication following acute myocardial infarctionI23.2 — Ventricular septal defect as current complication following acute myocardial infarctionI23.3 — Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarctionI23.4 — Rupture of chordae tendineae as current complication following acute myocardial infarctionI23.5 — Rupture of papillary muscle as current complication following acute myocardial infarctionI23.6 — Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarctionI23.7 — Postinfarction anginaI23.8 — Other current complications following acute myocardial infarction

Common synonyms

Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)Certain current complications following ST elevationCertain current complications following ST elevation STEMI and non-ST elevation NSTEMI myocardial infarction within the 28 day period

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.