Effects of heat and light (T67) ICD-10-CM
The T67 code range covers effects of heat and light with 50 ICD-10-CM diagnosis codes. 36 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- erythema [dermatitis] ab igne L59.0
- malignant hyperpyrexia due to anesthesia T88.3
- radiation-related disorders of the skin and subcutaneous tissue L55 L59
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category T67
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the T67 Range 50 codes · 36 billable
- T67 Effects of heat and lightNon-billable
- T67.0 Heatstroke and sunstrokeNon-billable
- T67.01 Heatstroke and sunstrokeNon-billable
- T67.01XA Heatstroke and sunstroke, initial encounter
- T67.01XD Heatstroke and sunstroke, subsequent encounter
- T67.01XS Heatstroke and sunstroke, sequela
- T67.02 Exertional heatstrokeNon-billable
- T67.02XA Exertional heatstroke, initial encounter
- T67.02XD Exertional heatstroke, subsequent encounter
- T67.02XS Exertional heatstroke, sequela
- T67.09 Other heatstroke and sunstrokeNon-billable
- T67.09XA Other heatstroke and sunstroke, initial encounter
- T67.09XD Other heatstroke and sunstroke, subsequent encounter
- T67.09XS Other heatstroke and sunstroke, sequela
- T67.1 Heat syncopeNon-billable
- T67.1XXA Heat syncope, initial encounter
- T67.1XXD Heat syncope, subsequent encounter
- T67.1XXS Heat syncope, sequela
- T67.2 Heat crampNon-billable
- T67.2XXA Heat cramp, initial encounter
- T67.2XXD Heat cramp, subsequent encounter
- T67.2XXS Heat cramp, sequela
- T67.3 Heat exhaustion, anhydroticNon-billable
- T67.3XXA Heat exhaustion, anhydrotic, initial encounter
- T67.3XXD Heat exhaustion, anhydrotic, subsequent encounter
- T67.3XXS Heat exhaustion, anhydrotic, sequela
- T67.4 Heat exhaustion due to salt depletionNon-billable
- T67.4XXA Heat exhaustion due to salt depletion, initial encounter
- T67.4XXD Heat exhaustion due to salt depletion, subsequent encounter
- T67.4XXS Heat exhaustion due to salt depletion, sequela
- T67.5 Heat exhaustion, unspecifiedNon-billable
- T67.5XXA Heat exhaustion, unspecified, initial encounter
- T67.5XXD Heat exhaustion, unspecified, subsequent encounter
- T67.5XXS Heat exhaustion, unspecified, sequela
- T67.6 Heat fatigue, transientNon-billable
- T67.6XXA Heat fatigue, transient, initial encounter
- T67.6XXD Heat fatigue, transient, subsequent encounter
- T67.6XXS Heat fatigue, transient, sequela
- T67.7 Heat edemaNon-billable
- T67.7XXA Heat edema, initial encounter
- T67.7XXD Heat edema, subsequent encounter
- T67.7XXS Heat edema, sequela
- T67.8 Other effects of heat and lightNon-billable
- T67.8XXA Other effects of heat and light, initial encounter
- T67.8XXD Other effects of heat and light, subsequent encounter
- T67.8XXS Other effects of heat and light, sequela
- T67.9 Effect of heat and light, unspecifiedNon-billable
- T67.9XXA Effect of heat and light, unspecified, initial encounter
- T67.9XXD Effect of heat and light, unspecified, subsequent encounter
- T67.9XXS Effect of heat and light, unspecified, sequela
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the T67 range.
Drug Fever
Drug-induced fever.
Heat Exhaustion
A clinical syndrome caused by heat stress, such as over-exertion in a hot environment or excessive exposure to sun. It is characterized by SWEATING, water (volume) depletion, salt depletion, cool clammy skin, NAUSEA, and HEADACHE.
Heat Stroke
A condition caused by the failure of body to dissipate heat in an excessively hot environment or during PHYSICAL EXERTION in a hot environment. Contrast to HEAT EXHAUSTION, the body temperature in heat stroke patient is dangerously high with red, hot skin accompanied by DELUSIONS; CONVULSIONS; or COMA. It can be a life-threatening emergency and is most common in infants and the elderly.
Hyperthermia
An abnormal elevation of body temperature, usually as a result of inability to regulate core body temperature due to non-pathologic factors.
Hyperthermia, Induced
Abnormally high temperature intentionally induced in living things regionally or whole body. It is most often induced by radiation (heat waves, infra-red), ultrasound, or drugs.
Malignant Hyperthermia
Rapid and excessive rise of temperature accompanied by muscular rigidity following general anesthesia.
Sunstroke
Heat stroke caused by exposure to the sun. It is characterized by dangerously high BODY TEMPERATURE; red, hot skin; DELUSIONS; CONVULSIONS; or COMA. It can be a life-threatening emergency and is most common in infants and the elderly.
About the T67 Code Range
The ICD-10 code section T67 covers medical conditions caused by the effects of heat and light, including heatstroke, heat exhaustion, heat cramps, and other related disorders. This section helps classify and code various heat-related injuries and illnesses for accurate medical documentation and billing.
This section includes codes for specific conditions such as heatstroke and sunstroke (T67.0, T67.01), also known as hyperthermia or heat exposure, which represent serious overheating of the body. There are separate codes for exertional heatstroke (T67.02), referring to heatstroke caused by physical activity. Other conditions like heat syncope (T67.1), heat cramp (T67.2), and different types of heat exhaustion (T67.3–T67.5) are also included, reflecting symptoms like fainting, muscle cramps, or salt depletion due to heat. Codes distinguish initial treatment, follow-up, and sequela, helping track patient progress. The section also captures rarer effects such as heat edema (T67.7) and other thermal injuries or dermatologic effects (T67.8). The ICD-10 code for heat exhaustion and related disorders is essential for documenting heat-induced illnesses accurately in healthcare settings.
Questions About This Page
How many billable codes are in the T67 range?
Of the 50 codes in this range, 36 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the T67 range classify?
The range classifies effects of heat and light. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
