Is I46.9 a billable ICD-10-CM code?

Yes. I46.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I46.9 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).

I46.9

I46.9 — Cardiac arrest, cause unspecified

Billable / specific codeICD-10-CM

I46.9 is a billable, specific ICD-10-CM code for cardiac arrest, cause unspecified. It is valid for submission on a claim.

Excludes2 inherited from the categories above I46.9

Also inherited, and the opposite of Excludes1: these conditions are not part of I46.9, but a patient can have both, so you may code both.

Written on I46 — Cardiac arrest

cardiogenic shock (R57.0)

Other codes that can never be billed with I46.9

These codes carry an Excludes1 note pointing at I46.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I46.9 alone.

R09.2Respiratory arrest

Risk adjustment

I46.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 213 Cardio-Respiratory Failure and Shock0.370 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

I46.9 is named in 23 Medicare coverage policies — 23 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52458Automatic External Defibrillators - Policy Article
A52458Automatic External Defibrillators - Policy Article
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography

How I46.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I46.9.

Arrest, arrested›cardiac

Code history

I46.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share I46. If I46.9 is not quite right, the correct code is usually one of these.

Questions about I46.9

Is I46.9 a billable ICD-10-CM code?: Yes. I46.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I46.9 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).