Heat fatigue, transient, initial encounter

This code signifies a mild, temporary form of heat-related illness characterized by symptoms such as fatigue, weakness, dizziness, and headache, occurring due to exposure to high temperatures. It represents a transient physiological response to heat stress, not involving significant organ damage or severe dehydration.

Apply this code for patients presenting with initial symptoms of heat fatigue that resolve quickly with rest and rehydration. This is appropriate for individuals experiencing their first episode of this condition, often after exertion in hot environments. It should be used when the patient does not exhibit signs of more severe heat-related illnesses like heat exhaustion or heatstroke.

• Ensure documentation clearly states "heat fatigue" and indicates the transient nature of the symptoms.
• Confirm this is the patient's initial encounter for this specific condition.
• Differentiate from heat exhaustion (T67.4) or heatstroke (T67.0) based on symptom severity and clinical presentation.