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v1.0.0
ICD-10 Guide
ICD-10 CodesQ21.4

Q21.4

Billable

Aortopulmonary septal defect

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 Q21.4 is a billable code used to indicate a diagnosis of aortopulmonary septal defect.

Key Diagnostic Point:

Aortopulmonary septal defect (APSD) is a rare congenital heart defect characterized by an abnormal connection between the aorta and the pulmonary artery. This defect results in a left-to-right shunt, leading to increased blood flow to the lungs and potential pulmonary overcirculation. Clinically, patients may present with symptoms such as dyspnea, fatigue, and signs of heart failure due to volume overload. The defect can occur as an isolated anomaly or in conjunction with other congenital heart defects, such as ventricular septal defects or patent ductus arteriosus. Diagnosis is typically made through echocardiography, which can visualize the defect and assess the hemodynamic impact. Management may involve surgical intervention to close the defect, especially in symptomatic patients or those with significant pulmonary hypertension. Long-term follow-up is essential to monitor for complications, including arrhythmias and heart failure.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in presentation and severity of symptoms
  • Potential for co-occurring congenital heart defects
  • Need for detailed documentation of hemodynamic status
  • Variations in surgical management and follow-up care

Audit Risk Factors

  • Inadequate documentation of associated congenital anomalies
  • Failure to capture the severity of symptoms
  • Misclassification of the defect type
  • Lack of follow-up documentation post-surgery

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Pediatric documentation should include growth parameters, developmental milestones, and specific symptoms related to cardiac function.

Common Clinical Scenarios

Common scenarios include infants presenting with failure to thrive, recurrent respiratory infections, or heart murmurs detected during routine examinations.

Billing Considerations

Accurate coding requires attention to the patient's age, symptomatology, and any interventions performed.

Genetics

Documentation Requirements

Genetic documentation should include family history of congenital heart defects and any genetic syndromes associated with the defect.

Common Clinical Scenarios

Genetic counseling may be needed for families with a history of congenital heart disease or when associated with chromosomal abnormalities.

Billing Considerations

Consideration of genetic testing results and their implications for family planning and management.

Coding Guidelines

Inclusion Criteria

Use Q21.4 When
  • Follow the official ICD
  • CM guidelines for coding congenital malformations, ensuring accurate documentation of the defect type, associated conditions, and any surgical interventions

Exclusion Criteria

Do NOT use Q21.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

33641CPT Code

Repair of aortopulmonary septal defect

Clinical Scenario

Used when surgical intervention is performed to correct the defect.

Documentation Requirements

Operative report detailing the procedure and any complications.

Specialty Considerations

Pediatric cardiology may require additional documentation regarding preoperative assessments.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of congenital heart defects, including APSD, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of congenital heart defects, including APSD, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    American Academy of Pediatrics - Congenital Heart Disease

Coding & Billing References

  • •
    American Academy of Pediatrics - Congenital Heart Disease

Frequently Asked Questions

What is the significance of aortopulmonary septal defect in pediatric patients?

Aortopulmonary septal defect can lead to significant pulmonary overcirculation and heart failure if not diagnosed and managed appropriately. Early detection and intervention are crucial for improving outcomes in affected children.