ICD-10 Code for Heat
Also indexed as (effects)
The ICD-10-CM code for heat is T67.9 — Effect of heat and light, unspecified. This is the code the Alphabetic Index gives for heat with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
T67.9 cannot be submitted on a claim. It is a header code, so a more specific code from the list below is required.
Which heat code should you use?
The Alphabetic Index lists 15 codes under Heat. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| apoplexy | T67.01 | Heatstroke and sunstroke | not billable |
| burn | L55.9 | Sunburn, unspecified | |
| collapse | T67.1 | Heat syncope | not billable |
| cramps | T67.2 | Heat cramp | not billable |
| dermatitis or eczema | L59.0 | Erythema ab igne [dermatitis ab igne] | |
| edema | T67.7 | Heat edema | not billable |
| excessive | T67.9 | Effect of heat and light, unspecified | not billable |
| exhaustion | T67.5 | Heat exhaustion, unspecified | not billable |
| fatigue | T67.6 | Heat fatigue, transient | not billable |
| fever | T67.01 | Heatstroke and sunstroke | not billable |
| hyperpyrexia | T67.01 | Heatstroke and sunstroke | not billable |
| prickly | L74.0 | Miliaria rubra | |
| pyrexia | T67.01 | Heatstroke and sunstroke | not billable |
| rash | L74.0 | Miliaria rubra | |
| specified effect NEC | T67.8 | Other effects of heat and light | not billable |
| stroke | T67.01 | Heatstroke and sunstroke | not billable |
| syncope | T67.1 | Heat syncope | not billable |
Heat excessive
| specified effect NEC | T67.8 | Other effects of heat and light | not billable |
Heat exhaustion
Codes under T67.9
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources