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2025 ICD-10-CM code X39.0

Exposure to natural radiation.

External cause codes are never sequenced as the primary diagnosis. They are used as secondary codes to provide additional information about the cause of the injury or health condition.If the intent is unknown or unspecified, code the intent as accidental.Most categories require a 7th character to indicate initial encounter (A), subsequent encounter (D), or sequela (S).

7th character is required.

Medical necessity for the use of this code is determined by the documented signs, symptoms, or health concerns related to the natural radiation exposure.

Clinicians should document the source of the natural radiation exposure, the duration of exposure, and any related health concerns.

IMPORTANT:Contact with and suspected exposure to radon and other naturally occurring radiation is classified under Z77.123, exposure to man-made radiation under W88-W90, and exposure to sunlight under X32.

In simple words: This code represents exposure to natural radiation sources, excluding radon, other naturally occurring radiation, man-made radiation, and sunlight.

Exposure to natural radiation. Excludes1: contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123) exposure to man-made radiation (W88-W90) exposure to sunlight (X32)

Example 1: A patient presents with symptoms consistent with radiation sickness after exploring a cave known for high levels of natural background radiation., A geologist working with radioactive minerals develops health issues due to prolonged occupational exposure to natural radiation., A researcher studying high-altitude environments experiences increased exposure to cosmic radiation and develops related symptoms.

Documentation should specify the type of natural radiation exposure, the circumstances of the exposure, the duration of the exposure, and any signs or symptoms related to the exposure.

** Reporting of ICD-10-CM external cause codes is generally not required unless mandated by state regulations or specific payers. However, voluntary reporting is encouraged for injury research and prevention.

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