ICD-10-CM 2027
ICD-10 code for heat
From the official ICD-10-CM alphabetic index entry “Heat (effects)”. Page updated September 29, 2026.
About coding heat
The ICD-10-CM code for heat is T67.9 (Effect of heat and light, unspecified). The official index lists 24 more specific codes, 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 heat codes (official index)
- apoplexy T67.01 — Heatstroke and sunstroke
- burn L55.9 — Sunburn, unspecified
- collapse T67.1 — Heat syncope
- cramps T67.2 — Heat cramp
- dermatitis or eczema L59.0 — Erythema ab igne [dermatitis ab igne]
- edema T67.7 — Heat edema
- erythema - code by site under Burn, first degree
- excessive T67.9 — Effect of heat and light, unspecified
- specified effect NEC T67.8 — Other effects of heat and light
- exhaustion T67.5 — Heat exhaustion, unspecified
- anhydrotic T67.3 — Heat exhaustion, anhydrotic
- due to
- salt (and water) depletion T67.4 — Heat exhaustion due to salt depletion
- water depletion T67.3 — Heat exhaustion, anhydrotic
- with salt depletion T67.4 — Heat exhaustion due to salt depletion
- fatigue (transient) T67.6 — Heat fatigue, transient
- fever T67.01 — Heatstroke and sunstroke
- hyperpyrexia T67.01 — Heatstroke and sunstroke
- prickly L74.0 — Miliaria rubra
- prostration
- pyrexia T67.01 — Heatstroke and sunstroke
- rash L74.0 — Miliaria rubra
- specified effect NEC T67.8 — Other effects of heat and light
- stroke T67.01 — Heatstroke and sunstroke
- exertional T67.02 — Exertional heatstroke
- specified NEC T67.09 — Other heatstroke and sunstroke
- sunburn
- syncope T67.1 — Heat syncope
Common questions about heat ICD-10 codes
What is the ICD-10 code for 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: T67.01, L55.9, T67.1, T67.2 and others below.
What is the ICD-10 code for apoplexy heat?
- T67.01 — Heatstroke and sunstroke (header code; choose a more specific subcode).
What is the ICD-10 code for burn heat?
- L55.9 — Sunburn, unspecified.
What is the ICD-10 code for collapse heat?
- T67.1 — Heat syncope (header code; choose a more specific subcode).
What is the ICD-10 code for cramps heat?
- T67.2 — Heat cramp (header code; choose a more specific subcode).
What is the ICD-10 code for dermatitis or eczema heat?
- L59.0 — Erythema ab igne [dermatitis ab igne].
What is the ICD-10 code for edema heat?
- T67.7 — Heat edema (header code; choose a more specific subcode).
Is T67.9 billable?
- No. T67.9 is a header code. Report one of its more specific subcodes instead.