2026 ICD-10-CM Diagnosis Code T67Effects of heat and light
T67 is a non-billable ICD-10-CM category code for effects of heat and light, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T67.01XA, T67.01XD, T67.01XS, and T67.02XA.
Code Identity
Code Classification
Specific Coding for Effects of heat and lightOverview
Non-specific codes like T67 require more characters. Use one of these billable codes instead:
T67.0 for Heatstroke and sunstroke
T67.01 for Heatstroke and sunstroke
T67.02 for Exertional heatstroke
T67.09 for Other heatstroke and sunstroke
T67.1 for Heat syncope
T67.2 for Heat cramp
T67.3 for Heat exhaustion, anhydrotic
T67.4 for Heat exhaustion due to salt depletion
T67.5 for Heat exhaustion, unspecified
T67.6 for Heat fatigue, transient
T67.7 for Heat edema
T67.8 for Other effects of heat and light
T67.9 for Effect of heat and light, unspecified
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Effects of heat and light (T67). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- 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
7th Character Note
- The appropriate 7th character is to be added to each code from category T67
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
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.
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.
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.
Indicates that a seventh character is to be assigned to codes in a subcategory.
Patient EducationClinical
Heat Illness
Your body normally cools itself by sweating. During hot weather, especially when it is very humid, sweating just isn't enough to cool you off. Your body temperature can rise to dangerous levels and you can develop a heat illness.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About T67Overview
Is T67 (Effects of heat and light) a billable code?
No. This is a category header that groups the codes for effects of heat and light, and headers cannot be submitted on claims. Claims for effects of heat and light need a more specific code from this category, such as T67.01XA, T67.01XD, and T67.01XS.
