Exposure to excessive natural heat (X30) ICD-10-CM
The X30 code range covers exposure to excessive natural heat with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Inclusion Terms
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.
- Exposure to excessive heat as the cause of sunstroke
- Exposure to heat NOS
Type 1 Excludes
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.
- 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
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.
- The appropriate 7th character is to be added to code X30
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the X30 Range 4 codes · 3 billable
About the X30 Code Range
During a heatwave, the weather can expose someone to too much heat. This exposure belongs to the group of external causes involving forces of nature.
X30 is divided by encounter. Its subdivisions identify an initial encounter (X30.XXXA), a subsequent encounter (X30.XXXD), or a sequela, meaning a later effect (X30.XXXS).
Questions About This Page
How many billable codes are in the X30 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the X30 range classify?
The range classifies exposure to excessive natural heat. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
