ICD-10-CM 2027
ICD-10 code for excessive heat
From the official ICD-10-CM alphabetic index entry “Heat (effects) › excessive”. Page updated September 29, 2026.
About coding excessive heat
The ICD-10-CM code for excessive heat is T67.9 (Effect of heat and light, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on T67.9.
Within T67, choose T67.9 (Effect of heat and light, unspecified) only when documentation doesn't support a more specific option: heatstroke and sunstroke (T67.0), heat syncope (T67.1), heat cramp (T67.2), heat exhaustion, anhydrotic (T67.3), heat exhaustion due to salt depletion (T67.4), heat exhaustion, unspecified (T67.5), heat fatigue, transient (T67.6), heat edema (T67.7) and 1 more.
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific excessive heat codes (official index)
- specified effect NEC T67.8 — Other effects of heat and light
Common questions about excessive heat ICD-10 codes
What is the ICD-10 code for excessive heat?
- T67.9 — Effect of heat and light, unspecified (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T67.8.
Is T67.9 billable?
- No. T67.9 is a header code. Report one of its more specific subcodes instead.