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v1.0.0
ICD-10 Guide
DiagnosesAtrial Septal Aneurysm

Atrial Septal Aneurysm

ICD-10 Coding for Atrial Septal Aneurysm(Q21.1, I51.0)

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

Diagnosis Overview

What is Atrial Septal Aneurysm?
Essential facts and insights about Atrial Septal Aneurysm

Key Clinical Considerations:

  • Palpitations, dyspnea, fatigue
  • Echocardiogram showing septal defect or aneurysm
  • Murmur on auscultation, possible right heart failure signs

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history and symptoms, imaging results, treatment plan
  • ICD-10-CM terminology: Atrial Septal Aneurysm (ASA), Atrial Septal Defect (ASD)
  • Example: 'Patient presents with palpitations and echocardiogram reveals atrial septal aneurysm.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use specific codes for accurate representation of the condition.
  • Common errors: Misclassifying ASA as ASD without proper documentation.

Code Exclusions

Important Exclusions

  • Other congenital heart defects, such as ventricular septal defects
  • Alternative codes: I25.5 (Ischemic heart disease due to coronary artery disease)

Related ICD-10 Codes

Primary Codes
Q21.1
Atrial septal defect, unspecified
I51.9
Heart disease, unspecified
Ancillary Codes
I63.9
Differential Codes
I51.0
Q21.1

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Adults and children with congenital heart defects
  • Cardiology clinics, hospitals, and outpatient 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.