ICD-10-CM 2027 diagnosis code

I31Other diseases of pericardium

Not billable — use a more specific code

I31 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I31

I31 is the ICD-10-CM diagnosis code for other diseases of pericardium. It belongs to block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I31.0 (pericarditis), I31.1 (pericarditis), I31.2 (classified), I31.3 ((noninflammatory)), I31.4 (tamponade), I31.8 (pericardium) and I31.9 (unspecified).

Don't report I31 together with the conditions in its Excludes1 note: diseases of pericardium specified as rheumatic (I09.2), postcardiotomy syndrome (I97.0) and traumatic injury to pericardium (S26.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under I31

Coding notes

Excludes1Not coded here — never report together with this code

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

Notes that apply from higher levels

Instructions written at a parent level also apply to I31.

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Codes whose notes reference I31

I09.2Excludes1

Code history

2016
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2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about I31

Is I31 billable?: No. I31 is a header code. Report one of its more specific subcodes instead.