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 | T67.01Not billable | Heatstroke and sunstroke |
| burn | L55.9 | Sunburn, unspecified |
| collapse | T67.1Not billable | Heat syncope |
| cramps | T67.2Not billable | Heat cramp |
| dermatitis or eczema | L59.0 | Erythema ab igne [dermatitis ab igne] |
| edema | T67.7Not billable | Heat edema |
| excessive | T67.9Not billable | Effect of heat and light, unspecified |
| exhaustion | T67.5Not billable | Heat exhaustion, unspecified |
| fatigue | T67.6Not billable | Heat fatigue, transient |
| fever | T67.01Not billable | Heatstroke and sunstroke |
| hyperpyrexia | T67.01Not billable | Heatstroke and sunstroke |
| prickly | L74.0 | Miliaria rubra |
| pyrexia | T67.01Not billable | Heatstroke and sunstroke |
| rash | L74.0 | Miliaria rubra |
| specified effect NEC | T67.8Not billable | Other effects of heat and light |
| stroke | T67.01Not billable | Heatstroke and sunstroke |
| syncope | T67.1Not billable | Heat syncope |
Heat excessive
| specified effect NEC | T67.8Not billable | Other effects of heat and light |
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