Exposure to other natural radiation, initial encounter

This code signifies a patient's initial contact with natural radiation sources other than sunlight, such as radon gas, cosmic radiation, or terrestrial radiation from the earth. It indicates the very first instance of a patient presenting for care related to this exposure, regardless of whether symptoms are present.

Utilize this code when documenting a patient's first encounter for assessment or treatment following exposure to natural radiation not specified elsewhere. Examples include initial evaluation for potential health effects after prolonged exposure to high levels of radon in a home, or a pilot's first visit concerning cumulative cosmic radiation exposure.

• Always assign a secondary code for any specific health effects or symptoms resulting from the radiation exposure.
• Ensure the "initial encounter" seventh character is appropriate for the patient's visit; subsequent visits would use different seventh characters.
• Distinguish this from exposure to man-made radiation (e.g., medical imaging, industrial accidents) and solar radiation.