2026 ICD-10-CM Diagnosis Code X30Exposure to excessive natural heat
X30 is a non-billable ICD-10-CM category code for exposure to excessive natural heat, so it cannot be submitted on claims. Use a more specific code from this category instead, such as X30.XXXA, X30.XXXD, and X30.XXXS.
Code Identity
Code Classification
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Exposure to excessive heat as the cause of sunstroke
- Exposure to heat NOS
Type 1 Excludes
- excessive heat of man-made origin W92
- exposure to man-made radiation W89
- exposure to sunlight X32
- exposure to tanning bed W89
7th Character Note
- The appropriate 7th character is to be added to code X30
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
Patient EducationClinical
Heat Illness
Your body normally cools itself by sweating. During hot weather, especially when it is very humid, sweating just isn't enough to cool you off. Your body temperature can rise to dangerous levels and you can develop a heat illness.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About X30Overview
Is X30 (Exposure to excessive natural heat) a billable code?
No. This is a category header that groups the codes for exposure to excessive natural heat, and headers cannot be submitted on claims. Claims for exposure to excessive natural heat need a more specific code from this category, such as X30.XXXA, X30.XXXD, and X30.XXXS.
