Exposure to radon, sequela

This code signifies a health condition or symptom that is a late effect or complication of previous exposure to radon. It indicates that the patient's current medical issue is directly attributable to a past radon exposure, rather than an acute or ongoing exposure.

Use this code when documenting a diagnosis, such as lung cancer or other respiratory diseases, that is definitively linked to a prior exposure to radon. This code is appropriate for patients presenting with long-term health problems where the etiology is determined to be a historical radon exposure.

• Assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., C34.xx for lung cancer).
• Ensure documentation clearly establishes the causal link between the current condition and the past radon exposure.
• Do not use for acute or ongoing radon exposure; refer to codes in category X39.01 for those scenarios.