2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Other diseases of pericardium
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I31: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I31, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming I31: they are not reported together with it, unless the two conditions are unrelated.

  • I09.2 Chronic rheumatic pericarditis
    chronic pericarditis not specified as rheumatic (I31.-)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I31Overview

What is the ICD-10 code for other diseases of pericardium?

I31 is the ICD-10-CM category for other diseases of pericardium, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can I31 be reported with I09.2?

Not as a rule. The Excludes1 note on I31 lists "diseases of pericardium specified as rheumatic (I09.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).