Is ICD-10-CM code I46 billable?

No, I46 (Cardiac arrest) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code I46 belong to?

I46 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

I46Not billable, use a more specific code below

Cardiac arrest

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

3 billable codes under I46: all are an MCC; all map to HCC 213 (Cardio-Respiratory Failure and Shock).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.

Instructional notes

Excludes2: not included here, code separately if applicable

cardiogenic shock (R57.0)

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)

Read Section I.C.9 (page 50)

All codes under I46

I46 can't be used on a claim. Pick a billable code below; grey headings group them.

I46 MS-DRGs

As the principal diagnosis, all 3 billable codes under I46 group to MS-DRG 296, 297, 298, 791, or 793 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to I46

Notes on these codes point to I46.

I50 Excludes2: cardiac arrest (I46.-)
R09.2 Excludes1: cardiac arrest (I46.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Sudden Cardiac Arrest

Sudden cardiac arrest (SCA) is a condition in which the heart suddenly stops beating. When that happens, blood stops flowing to the brain and other vital organs. If it is not treated, SCA usually causes death within minutes. But quick treatment with cardiopulmonary resuscitation (CPR) and a defibrillator may be lifesaving.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.