Cataclysmic storm (X37) ICD-10-CM
The X37 code range covers cataclysmic storm with 38 ICD-10-CM diagnosis codes. 27 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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 each code from category X37
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 X37 Range 38 codes · 27 billable
- X37 Cataclysmic stormNon-billable
- X37.0 HurricaneNon-billable
- X37.0XXA Hurricane, initial encounter
- X37.0XXD Hurricane, subsequent encounter
- X37.0XXS Hurricane, sequela
- X37.1 TornadoNon-billable
- X37.1XXA Tornado, initial encounter
- X37.1XXD Tornado, subsequent encounter
- X37.1XXS Tornado, sequela
- X37.2 Blizzard (snow)(ice)Non-billable
- X37.2XXA Blizzard (snow)(ice), initial encounter
- X37.2XXD Blizzard (snow)(ice), subsequent encounter
- X37.2XXS Blizzard (snow)(ice), sequela
- X37.3 Dust stormNon-billable
- X37.3XXA Dust storm, initial encounter
- X37.3XXD Dust storm, subsequent encounter
- X37.3XXS Dust storm, sequela
- X37.4 TidalwaveNon-billable
- X37.41 Tidal wave due to earthquake or volcanic eruptionNon-billable
- X37.41XA Tidal wave due to earthquake or volcanic eruption, initial encounter
- X37.41XD Tidal wave due to earthquake or volcanic eruption, subsequent encounter
- X37.41XS Tidal wave due to earthquake or volcanic eruption, sequela
- X37.42 Tidal wave due to stormNon-billable
- X37.42XA Tidal wave due to storm, initial encounter
- X37.42XD Tidal wave due to storm, subsequent encounter
- X37.42XS Tidal wave due to storm, sequela
- X37.43 Tidal wave due to landslideNon-billable
- X37.43XA Tidal wave due to landslide, initial encounter
- X37.43XD Tidal wave due to landslide, subsequent encounter
- X37.43XS Tidal wave due to landslide, sequela
- X37.8 Other cataclysmic stormsNon-billable
- X37.8XXA Other cataclysmic storms, initial encounter
- X37.8XXD Other cataclysmic storms, subsequent encounter
- X37.8XXS Other cataclysmic storms, sequela
- X37.9 Unspecified cataclysmic stormNon-billable
- X37.9XXA Unspecified cataclysmic storm, initial encounter
- X37.9XXD Unspecified cataclysmic storm, subsequent encounter
- X37.9XXS Unspecified cataclysmic storm, sequela
About the X37 Code Range
The ICD-10 code X37 covers cataclysmic storms, including specific natural events like hurricanes, tornadoes, blizzards, dust storms, tidal waves, and other similar storm types. These codes capture medical encounters related to injuries or accidents caused by such extreme weather or environmental phenomena.
This coding section is used to specify the type of cataclysmic storm involved, such as X37.0 for hurricane (also known as cyclone or accident caused by high wind), X37.1 for tornado (including subtropical or tropical cyclones), and X37.2 for blizzard (snowstorm or ice storm). It also includes codes for tidal wave events linked to earthquakes or volcanic eruptions (commonly called tsunami) and tidal waves caused by storms or landslides. For each storm type, the ICD-10 system distinguishes between initial medical encounters (e.g., X37.0XXA for hurricane initial encounter), subsequent encounters, and sequela, which refer to after-effects or complications following the storm-related injury. Other cataclysmic storms, such as hailstorms, gale, thunderstorm, or torrential rain, fall under X37.8. When the storm type is unspecified, codes under X37.9 are used. These detailed classifications help ensure accurate documentation and coding of storm-related injuries and accidents in healthcare records.
Questions About This Page
How many billable codes are in the X37 range?
Of the 38 codes in this range, 27 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the X37 range classify?
The range classifies cataclysmic storm. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
