Heatstroke and sunstroke, initial encounter

This code signifies a severe, life-threatening condition resulting from prolonged exposure to high temperatures, leading to the body's inability to regulate its own temperature. It encompasses both heatstroke, characterized by a core body temperature above 104°F (40°C) with central nervous system dysfunction, and sunstroke, which is a form of heatstroke specifically caused by direct sun exposure.

Apply this code for patients presenting with the initial episode of heatstroke or sunstroke requiring medical attention. This includes emergency department visits, hospital admissions, or initial outpatient encounters for acute management of this condition. It is appropriate when the patient is actively experiencing the effects of severe heat illness for the first time.

• Ensure documentation clearly specifies "initial encounter" for the heatstroke or sunstroke.
• Do not use for subsequent encounters for sequelae or follow-up care of a previously treated heatstroke.
• Consider additional codes for associated symptoms or complications, such as dehydration (E86.0) or acute kidney injury (N17.-).