All ICD10 Codes
I32Billable, valid for claims from October 1, 2026

Pericarditis in diseases classified elsewhere

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

  • I32 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under I30-I5A below.
  • As a secondary diagnosis it is a CC (complication or comorbidity), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 16 closely related codes.
  • Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
  • AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
  • Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)

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Instructional notes

Excludes1: not coded here, use a different code

Code first: code the underlying condition first, then this code

  • underlying disease

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.

Read Section I.C.9 (page 50)

Other codes under I30-I5A

Other forms of heart disease (I30-I5A)

I32 MS-DRGs

As the principal diagnosis, I32 groups to MS-DRG 314, 315, 316, 791, or 793 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Related conditions

Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.

I32 is in Pericarditis and pericardial disease (CIR006), with 18 codes. Others in it:

  • A39.53 Meningococcal pericarditis
  • B33.23 Viral pericarditis
  • I01.0 Acute rheumatic pericarditis
  • I09.2 Chronic rheumatic pericarditis
  • I30.0 Acute nonspecific idiopathic pericarditis
  • I30.1 Infective pericarditis
  • I30.8 Other forms of acute pericarditis
  • I30.9 Acute pericarditis, unspecified

Medicare coverage articles listing I32

These 8 Medicare billing and coding articles list I32 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.

Other codes that refer to I32

Notes on these codes point to I32.

  • B39 Use Additional Code: pericarditis (I32)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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 more about pericardial disorders on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.

ICD-9-CM equivalent

Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).

  • 420.0 Acute pericarditis in diseases classified elsewhere (approximate)
ICD-9 to ICD-10 converter