2027 ICD-10-CM Diagnosis Code I32Pericarditis in diseases classified elsewhere

ICD-10-CM Codes›I00–I99›I30-I5A›I32

ICD-10-CM I32
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I32 is a billable ICD-10-CM diagnosis code for pericarditis in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 314 through 316, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 16 closely related codes. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pericarditis and pericardial disease.

Code Identity

ICD-10-CM Code
I32
Billable Status
Yes — Valid for Submission
Code Describes
Pericarditis in diseases classified elsewhere
Short Description
Pericarditis in diseases classified elsewhere
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
CategoryI32Pericarditis in diseases classified elsewhere
This CodeI32Pericarditis in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I32.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute pericarditis secondary to uremia
  • African histoplasmosis
  • Chronic pericarditis
  • Histoplasma capsulatum with pericarditis
  • Histoplasma duboisii with pericarditis
  • Histoplasmosis with pericarditis
  • Pericarditis associated with atrial septal defect
  • Pericarditis associated with severe chronic anemia
  • Pericarditis due to familial Mediterranean fever
  • Pericarditis due to infectious mononucleosis
  • Pericarditis due to metabolic disease
  • Pericarditis secondary to aortic aneurysm
  • Pericarditis secondary to myxedema
  • Pericarditis secondary to non-penetrating trauma
  • Pericarditis secondary to uremia
  • Post-cardiac injury syndrome
  • Post-traumatic pericarditis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I32: 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.

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.-)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying disease

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I32, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and I32 is one of the codes named.

  • B39 Histoplasmosis
    pericarditis (I32)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR006
Pericarditis and pericardial disease
Default principal diagnosis: inpatient No · outpatient No

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.

Convert I32 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
420.0 Ac pericardit in oth dis
Approximate The match is approximate rather than exact.

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 I32Overview

What is the ICD-10 code for pericarditis in diseases classified elsewhere?

The ICD-10-CM code for pericarditis in diseases classified elsewhere is I32. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is I32 (Pericarditis in diseases classified elsewhere) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pericarditis in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I32 group to?

On inpatient claims, pericarditis in diseases classified elsewhere maps to MS-DRG 793, 791, 314, 316, 315, with relative weights from 0.6678 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I32 a CC or MCC?

CMS lists I32 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 16 closely related codes in its exclusion list.

Can I32 be a principal diagnosis?

No. This is a manifestation code: pericarditis in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.