2025 ICD-10-CM Diagnosis Code I31.31

Malignant pericardial effusion in diseases classified elsewhere

• I31.31 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Malignant pericardial effusion in diseases classd elswhr
• The 2025 edition of ICD-10-CM I31.31 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I31.31 – other international versions of ICD-10 I31.31 may differ.

ICD-10-CM Coding Rules

• I31.31 describes the manifestation of an underlying disease, not the disease itself.

Code First

• underlying neoplasm (C00-D49 )

The following code(s) above I31.31 contain annotation back-references

 that may be applicable to I31.31:

• I00-I99  Diseases of the circulatory system
• I31  Other diseases of pericardium
• I31.3  Pericardial effusion (noninflammatory)

ICD-10-CM I31.31 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 314 Other circulatory system diagnoses with mcc
• 315 Other circulatory system diagnoses with cc
• 316 Other circulatory system diagnoses without cc/mcc

Code History

• 2023 (effective 10/1/2022): New code
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Code annotations containing back-references to I31.31:

• Type 1 Excludes: I31.2

Diagnosis Index entries containing back-references to I31.31:

• Effusion
  • pericardium, pericardial (noninflammatory) I31.39
    • malignant, in disease classified elsewhere I31.31