T67.4XXD Heat exhaustion due to salt depletion, subsequent encounter

ICD-10-CM T67.4XXD: Heat exhaustion due to salt depletion, subsequent encounter

ICD-10-CM code T67.4XXD identifies heat exhaustion due to salt depletion during a subsequent encounter. Heat exhaustion is the body's response to an excessive loss of water and salt, usually through excessive sweating. The condition is characterized by an inability to effectively exercise in the heat and is associated with cardiovascular insufficiency and energy depletion. 3 4 1

What this code represents

Code T67.4XXD designates heat exhaustion due to salt depletion for a subsequent encounter, and heat exhaustion is defined as the body's response to an excessive loss of water and salt, usually through excessive sweating. 4 3

Plain-language overview

Heat exhaustion is the inability to effectively exercise in the heat, secondary to a combination of factors including cardiovascular insufficiency, hypotension, energy depletion, and central fatigue. 1

Clinical context

The presumed cause of heat exhaustion is loss of fluid and electrolytes, primarily sodium, chloride, and potassium, but there are no objective markers to define the syndrome. 2

Heat exhaustion may be present if the patient demonstrates excessive fatigue, faints, or collapses with minor cognitive changes such as headache, dizziness, or confusion while performing physical activity. 1

Heat exhaustion can develop over several days in unacclimatized people and is often misdiagnosed as summer flu because of findings of weakness, fatigue, headache, dizziness, anorexia, nausea, vomiting, and diarrhea. 2

What the sources add

The National Athletic Trainers' Association describes heat exhaustion as involving an elevated core body temperature usually below 40.5°C, whereas the Centers for Disease Control and Prevention defines it generally as an excessive loss of water and salt. 1 3

The Centers for Disease Control and Prevention states that heat exhaustion can progress to heat stroke without cessation of activity and cooling measures, while the National Athletic Trainers' Association notes that absent end-organ damage distinguishes heat exhaustion from heat injury. 2 1

Documentation considerations

Mental changes such as irritability, confusion, or irrational behavior might be present in heat exhaustion, but major neurologic signs including seizures or coma indicate heat stroke or profound hyponatremia. 2

Sources

1. National Athletic Trainers' Association Position Statement: Exertional Heat Illnesses — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Heat and Cold Illness in Travelers — cdc.gov; accessed 2026-07-25.
3. Heat-related Illnesses — cdc.gov; accessed 2026-07-25.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.