2026 ICD-10-CM Diagnosis Code I32Pericarditis in diseases classified elsewhere
ICD-10-CM Codes›I00–I99›I30-I5A›I32
- Billable — Valid for Submission
- Not Chronic
I32 is a billable ICD-10-CM diagnosis code for pericarditis in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. 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
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for I32.
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 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
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- underlying disease
Type 1 Excludes
- pericarditis (in):
- coxsackie virus B33.23
- gonococcal A54.83
- meningococcal A39.53
- rheumatoid arthritis M05.31
- syphilitic A52.06
- systemic lupus erythematosus M32.12
- tuberculosis A18.84
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About I32Overview
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, 2025 through September 30, 2026.
What MS-DRG does I32 group to?
On inpatient claims, pericarditis in diseases classified elsewhere maps to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
What is the ICD-9 equivalent of I32?
Under the General Equivalence Mappings, pericarditis in diseases classified elsewhere converts to ICD-9-CM 420.0 (ac pericardit in oth dis). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
