I31.9 – Disease of pericardium, unspecified

ICD-10-CM 2027 diagnosis code · Other forms of heart disease

Billable code

ICD-10-CM code I31.9

Code: I31.9 (claims format: I319)
Description: Disease of pericardium, unspecified
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I30-I5A Other forms of heart disease
Parent codes: I31

Notes for I31.9

Applicable to:

Pericarditis (chronic) NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I31 – Other diseases of pericardium

Excludes1 (not coded here):

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

Index terms for I31.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I31

I31.0 – Chronic adhesive pericarditisBillable
I31.1 – Chronic constrictive pericarditisBillable
I31.2 – Hemopericardium, not elsewhere classifiedBillable
I31.3 – Pericardial effusion (noninflammatory)Header
I31.4 – Cardiac tamponadeBillable
I31.8 – Other specified diseases of pericardiumBillable

Frequently asked questions

What is ICD-10 code I31.9?

I31.9 is the ICD-10-CM code for disease of pericardium, unspecified, in the block I30-I5A (Other forms of heart disease).

Is I31.9 a billable code?

Yes. I31.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I31.9 belong to?

It belongs to category I31 – Other diseases of pericardium.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.