2025 ICD-10-CM code X30

Exposure to excessive natural heat.

This code should be used as a secondary code to a code from another chapter indicating the nature of the heat-related illness (e.g., heatstroke, heat exhaustion).

Medical necessity is established by the presence of signs and symptoms of a heat-related illness resulting from excessive natural heat exposure.

Clinicians should document the specific symptoms and severity of the heat-related illness, along with any contributing factors.

In simple words: Exposure to excessive environmental heat resulting in a heat-related illness.

Exposure to excessive natural heat as the cause of sunstroke. Exposure to heat NOS. Excludes1: excessive heat of man-made origin (W92) exposure to man-made radiation (W89) exposure to sunlight (X32) exposure to tanning bed (W89)

Example 1: A patient presents to the emergency room with heatstroke after prolonged exposure to high temperatures during a heatwave., A hiker collapses on a trail due to heat exhaustion after hiking in extreme heat., A construction worker experiences heat syncope while working outdoors in direct sunlight during the summer months.

Documentation should include the patient's symptoms (e.g., dizziness, nausea, headache, confusion, loss of consciousness), vital signs, duration of exposure, environmental conditions, and any pre-existing medical conditions.

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