2026 ICD-10-CM Diagnosis Code I31.39Other pericardial effusion (noninflammatory)

ICD-10-CM Codes›I00–I99›I30-I5A›I31

ICD-10-CM I31.39
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I31.39 is a billable ICD-10-CM diagnosis code for other pericardial effusion (noninflammatory). 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
I31.39
Billable Status
Yes — Valid for Submission
Code Describes
Other pericardial effusion (noninflammatory)
Short Description
Other pericardial effusion (noninflammatory)
Same as the full description in the CMS dataset.
Parent Code
I31.3
Pericardial effusion (noninflammatory)

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI31Other diseases of pericardium
This CodeI31.39Other pericardial effusion (noninflammatory)

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic cholesterol pericardial effusion
  • Chronic effusive pericarditis
  • Chronic pericarditis
  • Chylopericardium
  • Congenital pericardial effusion
  • Hydropericardium
  • Pericardial effusion
  • Pericardial effusion - noninflammatory
  • Pericarditis secondary to chylopericardium
  • Post-cardiac injury syndrome
  • Post-infarction pericarditis
  • Postmyocardial infarction pericardial effusion
  • Postoperative chylopericardium
  • Postoperative pericardial effusion

Tabular List NotesGuidance

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

Inclusion Terms

  • Chylopericardium

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.

    • Chylopericardium
    • Effusion
      • pericardium, pericardial (noninflammatory)
    • Effusion
      • pericardium, pericardial (noninflammatory)
        • specified type, NEC

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

  • Pericardial Effusion

    fluid accumulation within the pericardium. serous effusions are associated with pericardial diseases. hemopericardium is associated with trauma. lipid-containing effusion (chylopericardium) results from leakage of thoracic duct. severe cases can lead to cardiac tamponade.

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.

Code History & ChangesHistory

Replacement I31.39 replaces the following previously assigned code(s):

  • I31.3 - Pericardial effusion (noninflammatory)
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I31.39Overview

Is I31.39 (Pericardial effusion (noninflammatory)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other pericardial effusion (noninflammatory) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I31.39 group to?

When other pericardial effusion (noninflammatory) 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.

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.