ICD-10 Code for Heat

The default ICD-10-CM 2027 code for heat (effects) is T67.9 – Effect of heat and light, unspecified (a header – choose a more specific code). More specific codes depend on the details documented, as listed in the official index (15 codes, 3 billable).

Main code: T67.9 – Effect of heat and light, unspecified
Billable: No – header code

Index entries for Heat

apoplexy – T67.01 (header)
burn – L55.9 – see also Burn
collapse – T67.1 (header)
cramps – T67.2 (header)
dermatitis or eczema – L59.0
edema – T67.7 (header)
erythema - code by site under Burn, first degree
excessive – T67.9 (header)
- specified effect NEC – T67.8 (header)
exhaustion – T67.5 (header)
- anhydrotic – T67.3 (header)
- due to
  - salt (and water) – T67.4 (header)
  - water depletion – T67.3 (header)
    - with salt depletion – T67.4 (header)
fatigue (transient) – T67.6 (header)
fever – T67.01 (header)
hyperpyrexia – T67.01 (header)
prickly – L74.0
prostration – see Heat, exhaustion
pyrexia – T67.01 (header)
rash – L74.0
specified effect NEC – T67.8 (header)
stroke – T67.01 (header)
- exertional – T67.02 (header)
- specified NEC – T67.09 (header)
sunburn – see Sunburn
syncope – T67.1 (header)

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.