2027 ICD-10-CM Diagnosis Code T67Effects of heat and light

ICD-10-CM Codes›S00–T88›T66-T78›T67

ICD-10-CM T67
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

ICD-10-CM Code
T67
Billable Status
No — Non-Billable Category
Code Describes
Effects of heat and light
Short Description
Effects of heat and light
Same as the full description in the CMS dataset.
Chapter
T66-T78
Other and unspecified effects of external causes

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT66-T78Other and unspecified effects of external causes
CategoryT67Effects of heat and light
This CodeT67Effects of heat and light

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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T67: its own notes plus those printed at block T66-T78 and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • erythema [dermatitis] ab igne (L59.0)
  • malignant hyperpyrexia due to anesthesia (T88.3)
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On T67 itself
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block T66-T78 Other and unspecified effects of external causes applies to 456 codes
  • if applicable, place of occurrence, such as:
  • highway rest stop (Y92.523)
  • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
  • service areas as the place of occurrence of the external cause (Y92.52-)
  • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
  • transport vehicle as the place of occurrence of the external cause (Y92.81-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category T67
Values for category T67 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T67, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming T67: they are not reported together with it, unless the two conditions are unrelated.

  • R53.8 Other malaise and fatigue
    exhaustion and fatigue due to heat (T67.-)

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

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T67Overview

What is the ICD-10 code for effects of heat and light?

T67 is the ICD-10-CM category for effects of heat and light, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can T67 be reported with L59.0?

Not as a rule. The Excludes1 note on T67 lists "erythema [dermatitis] ab igne (L59.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).