Is I31 a billable ICD-10-CM code?

No. I31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does I31 sit in the tabular list?

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

What cannot be coded together with I31?

I31 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.

I31

I31 — Other diseases of pericardium

Non-billable headerICD-10-CM

I31 is a non-billable header ICD-10-CM code for other diseases of pericardium. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

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

diseases of pericardium specified as rheumatic (I09.2)
postcardiotomy syndrome (I97.0)
traumatic injury to pericardium (S26.-)

Other codes that can never be billed with I31

These codes carry an Excludes1 note pointing at I31. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I31 alone.

I09.2Chronic rheumatic pericarditis
I23.0Hemopericardium as current complication following acute myocardial infarction
I31.2Hemopericardium, not elsewhere classified

Risk adjustment

I31 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

I31 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead I31

7 child codes. Green means billable.

Questions about I31

Is I31 a billable ICD-10-CM code?: No. I31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does I31 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).
What cannot be coded together with I31?: I31 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.