Heat fatigue, transient

This code represents a mild, transient form of heat-related illness characterized by symptoms such as fatigue, weakness, dizziness, and headache, typically occurring after exposure to high temperatures. It signifies a temporary physiological response to heat stress without significant organ damage or severe dehydration.

Use this code when documentation indicates a patient experienced heat-induced fatigue or malaise that resolved quickly with rest and hydration, without progressing to heat exhaustion or heatstroke. Supporting documentation should clearly state the patient's symptoms are attributable to heat exposure and are not indicative of a more severe heat-related condition.

• Differentiate from more severe heat disorders like heat exhaustion (992.5) or heatstroke (992.0).
• Ensure documentation specifies "transient" or "mild" heat fatigue to support this code.
• Consider external cause codes (E-codes) to describe the circumstances of heat exposure, if applicable.