Congenital malformation of cardiac septum, unspecified

This code signifies a birth defect affecting the walls that separate the heart's chambers, where the specific type or location of the septal defect is not documented. It indicates an abnormal development of either the atrial or ventricular septum, or both, present from birth.

Use this code when medical records indicate a congenital cardiac septal defect, but the physician's documentation does not specify whether it's an atrial septal defect (ASD), ventricular septal defect (VSD), or another specific type. This code is appropriate when the exact nature of the septal malformation is unknown or unstated.

• Avoid using this code if more specific documentation is available (e.g., Q21.0 for VSD, Q21.1 for ASD).
• Query the provider for clarification if the documentation mentions a septal defect but lacks specificity.
• This code should be used as a last resort when no further detail about the septal defect can be obtained.