2026 ICD-10-CM Diagnosis Code I30.1Infective pericarditis

ICD-10-CM Codes›I00–I99›I30-I5A›I30

ICD-10-CM I30.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I30.1 is a billable ICD-10-CM diagnosis code for infective pericarditis. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pericarditis and pericardial disease.

Code Identity

ICD-10-CM Code
I30.1
Billable Status
Yes — Valid for Submission
Code Describes
Infective pericarditis
Short Description
Infective pericarditis
Same as the full description in the CMS dataset.
Parent Code
I30
Acute pericarditis

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI30Acute pericarditis
This CodeI30.1Infective pericarditis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute bacterial pericarditis
  • Acute infective pericarditis
  • Acute pneumococcal pericarditis
  • Acute purulent pericarditis
  • Acute staphylococcal pericarditis
  • Acute streptococcal pericarditis
  • Acute viral pericarditis
  • Bacterial pericarditis
  • Constrictive pericarditis
  • Constrictive pericarditis caused by virus
  • Infectious pericarditis
  • Infective constrictive pericarditis
  • Mycotic pericarditis
  • Parasitic pericarditis
  • Pericarditis caused by Haemophilus
  • Pneumopyopericardium
  • Pyogenic pericarditis
  • Pyopericardium
  • Viral pericarditis
  • Viral pericarditis - virus unidentified
  • Viral pericarditis with pericardial effusion

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Pneumococcal pericarditis
  • Pneumopyopericardium
  • Purulent pericarditis
  • Pyopericarditis
  • Pyopericardium
  • Pyopneumopericardium
  • Staphylococcal pericarditis
  • Streptococcal pericarditis
  • Suppurative pericarditis
  • Viral pericarditis

Use Additional Code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • pericardial
    • Pericarditis(with decompensation) (with effusion)
      • bacterial (acute) (subacute) (with serous or seropurulent effusion)
    • Pericarditis(with decompensation) (with effusion)
      • fibrinopurulent
    • Pericarditis(with decompensation) (with effusion)
      • infective
    • Pericarditis(with decompensation) (with effusion)
      • pneumococcal
    • Pericarditis(with decompensation) (with effusion)
      • purulent
    • Pericarditis(with decompensation) (with effusion)
      • septic
    • Pericarditis(with decompensation) (with effusion)
      • staphylococcal
    • Pericarditis(with decompensation) (with effusion)
      • streptococcal
    • Pericarditis(with decompensation) (with effusion)
      • suppurative
    • Pericarditis(with decompensation) (with effusion)
      • viral
    • Pneumopyopericardium
    • Pyopericarditis, pyopericardium
    • Pyopneumopericardium

Clinical ClassificationClinical

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

CCSR CIR006
Pericarditis and pericardial disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Bacterial Pericarditis

    pericarditis that is caused by an infection with a bacterial agent.

  • Viral Pericarditis

    pericarditis that is caused by an infection with a viral agent.

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 I30.1 to ICD-9-CMHistory

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

ICD-9-CM
420.90 Acute pericarditis NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I30.1Overview

Is I30.1 (Acute pericarditis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report infective pericarditis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I30.1 group to?

When infective pericarditis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I30.1?

Under the General Equivalence Mappings, infective pericarditis converts to ICD-9-CM 420.90 (acute pericarditis NOS). 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.