2026 ICD-10-CM Diagnosis Code I31Other diseases of pericardium

ICD-10-CM Codes›I00–I99›I30-I5A›I31

ICD-10-CM I31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I31 is a non-billable ICD-10-CM category code for other diseases of pericardium, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I31.0, I31.1, I31.2, and I31.31.

Code Identity

ICD-10-CM Code
I31
Billable Status
No — Non-Billable Category
Code Describes
Other diseases of pericardium
Chapter
I30-I5A
Other forms of heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI31Other diseases of pericardium
This CodeI31Other diseases of pericardium

Specific Coding for Other diseases of pericardiumOverview

Non-specific codes like I31 require more characters. Use one of these billable codes instead:

  • Use I31.0 for Chronic adhesive pericarditis

  • Use I31.1 for Chronic constrictive pericarditis

  • Use I31.2 for Hemopericardium, not elsewhere classified

  • I31.3 for Pericardial effusion (noninflammatory)

  • Use I31.31 for Malignant pericardial effusion in diseases classified elsewhere

  • Use I31.39 for Other pericardial effusion (noninflammatory)

  • Use I31.4 for Cardiac tamponade

  • Use I31.8 for Other specified diseases of pericardium

  • Use I31.9 for Disease of pericardium, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

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

Patient EducationClinical

Pericardial Disorders

The pericardium is a membrane, or sac, that surrounds your heart. It holds the heart in place and helps it work properly. Problems with the pericardium include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I31Overview

Is I31 (Other diseases of pericardium) a billable code?

No. This is a category header that groups the codes for other diseases of pericardium, and headers cannot be submitted on claims. Claims for other diseases of pericardium need a more specific code from this category, such as I31.0, I31.1, and I31.2.