Is I23.4 a billable ICD-10-CM code?

Yes. I23.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I23.4 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).

What cannot be coded together with I23.4?

I23.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

I23.4

I23.4 — Rupture of chordae tendineae as current complication following acute myocardial infarction

Billable / specific codeICD-10-CM

I23.4 is a billable, specific ICD-10-CM code for rupture of chordae tendineae as current complication following acute myocardial infarction. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

rupture of chordae tendineae not specified as current complication following acute myocardial infarction (I51.1)

Other codes that can never be billed with I23.4

These codes carry an Excludes1 note pointing at I23.4. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I23.4 alone.

I51.1Rupture of chordae tendineae, not elsewhere classified

Risk adjustment

I23.4 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 229 Unstable Angina and Other Acute Ischemic Heart Disease0.240 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

I23.4 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.

A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A52868Billing and Coding: Transesophageal Echocardiography (TEE)
A52868Billing and Coding: Transesophageal Echocardiography (TEE)

How I23.4 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 I23.4.

Laceration›chordae tendinae NEC›following acute myocardial infarction(current complication)
Rupture, ruptured›chordae tendineae NEC›following acute myocardial infarction(current complication)
Complication›following›acute myocardial infarction NEC›chordae tendinae rupture
Complication›following›acute myocardial infarction NEC›rupture›chordae tendineae

Related codes at this level

Codes that share I23. If I23.4 is not quite right, the correct code is usually one of these.

Questions about I23.4

Is I23.4 a billable ICD-10-CM code?: Yes. I23.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I23.4 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).
What cannot be coded together with I23.4?: I23.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.