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v1.0.0
ICD-10 Guide
DiagnosesPericardial Effusion

Pericardial Effusion

ICD-10 Coding for Pericardial Effusion(I31.31, I31.39, I31.4)

PRIMARY SPECIALTYCardiology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Pericardial Effusion?
Essential facts and insights about Pericardial Effusion

Key Clinical Considerations:

  • Chest pain or discomfort
  • Shortness of breath
  • Palpitations
  • Echocardiogram showing fluid accumulation
  • Chest X-ray revealing enlarged cardiac silhouette
  • Electrocardiogram changes (e.g., low voltage QRS)

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including symptoms and duration
  • Results of imaging studies (e.g., echocardiogram, CT scan)
  • Physical exam findings (e.g., muffled heart sounds, jugular venous distension)
  • Assessment of underlying causes (e.g., infection, malignancy)

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for distinguishing between acute and chronic effusion.
  • Common errors include misclassifying the cause of effusion.

Code Exclusions

Important Exclusions

  • Cardiac tamponade (I31.0)
  • Congestive heart failure (I50.x)
  • Other pericardial diseases not related to effusion

Related ICD-10 Codes

Primary Codes
I31.9
Pericardial effusion, unspecified
I31.8
Other specified diseases of pericardium
Ancillary Codes
C78.2
Differential Codes
I31.39
I31.39
for non-malignant, non-inflammatory effusions.
I31.31
I31.31
when effusion is confirmed malignant.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patients with heart disease, infections, or malignancies
  • Emergency departments, cardiology clinics, and inpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What are the documentation requirements?

Document clinical findings, imaging results, and any underlying conditions.

What are the billing considerations?

Ensure accurate coding based on the type and cause of effusion for proper reimbursement.