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v1.0.0
ICD-10 Guide
DiagnosesAtrial Thrombus

Atrial Thrombus

ICD-10 Coding for Atrial Thrombus(I51.3, I23.6)

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

Diagnosis Overview

What is Atrial Thrombus?
Essential facts and insights about Atrial Thrombus

Key Clinical Considerations:

  • Palpitations, shortness of breath, or chest pain
  • Echocardiogram showing thrombus in the atrium, CT or MRI findings
  • Irregular heartbeat, signs of heart failure on examination

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, physical exam findings, imaging results
  • ICD-10-CM codes for atrial thrombus, specific location
  • Example: 'Patient presents with atrial thrombus confirmed by echocardiogram.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding atrial thrombus versus other thrombotic conditions.
  • Common errors include misclassifying the location of the thrombus.

Code Exclusions

Important Exclusions

  • Pulmonary embolism, deep vein thrombosis
  • Alternative codes for other types of thrombus

Related ICD-10 Codes

Primary Codes
I82.409
Acute embolism and thrombosis of unspecified deep veins of lower extremity
I48.91
Unspecified atrial fibrillation
Ancillary Codes
I48.XX
Z79.01
Differential Codes
I23.6
I51.3

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patients with atrial fibrillation, heart failure, or recent cardiac surgery
  • Cardiology clinics, emergency departments, 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

Documentation requirements?

Include detailed patient history, imaging results, and clinical findings.

Billing considerations?

Ensure accurate coding to reflect the complexity of the condition and associated treatments.