Exposure to radon, initial encounter

This code signifies a patient's initial documented exposure to radon gas, a naturally occurring radioactive gas that can accumulate in homes and buildings. Such exposure can pose a long-term health risk, primarily increasing the likelihood of developing lung cancer. This code is used when the exposure event itself is being identified and recorded for the first time.

Use this code when a patient presents with a history of recent or newly identified radon exposure, such as after a home radon test reveals elevated levels. It is appropriate for the initial assessment and documentation of the exposure event, even if no immediate symptoms or definitive health effects are yet apparent.

• This code is for the initial encounter of exposure; subsequent encounters for the same exposure would use a different seventh character.
• Always sequence this code as a secondary diagnosis when a specific health condition, such as lung cancer, is also present and linked to the radon exposure.
• Ensure documentation clearly states the patient's exposure to radon and that this is the first time this specific exposure is being addressed in the medical record.