Exposure to forces of nature (X30-X39) ICD-10-CM
The X30–X39 section covers exposure to forces of nature with 85 ICD-10-CM diagnosis codes, of which 60 are billable in fiscal year 2026. The section is organized into the 9 code ranges listed below.
Code Ranges in This Section 9 ranges · 85 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the X30–X39 Code Range
ICD-10 codes X30 through X39 cover medical conditions and injuries caused by various natural forces and environmental exposures, including heat, cold, sunlight, earthquakes, storms, floods, and other natural events. These codes specify whether the encounter is initial, subsequent, or related to sequela (aftereffects), helping detailed tracking and treatment of these cases.
This range addresses specific exposures such as exposure to excessive natural heat (X30) often referred to as heatwave or heat-induced dermatosis, and exposure to excessive natural cold (X31), including conditions like hypothermia caused by cold weather. Codes like X32 relate to injuries from sunlight exposure, covering solar urticaria and phototoxic dermatitis. Natural disasters are extensively coded: X34–X36 cover earthquakes, volcanic eruptions, and earth movements such as avalanches and landslides. Cataclysmic storms, including hurricanes (X37.0), tornadoes (X37.1), blizzards (X37.2), and dust storms (X37.3), also feature detailed codes. Flooding incidents are documented under X38, while X39 includes exposure to other forces like natural radiation (radon or solar radiation storm) and less common events such as droughts, meteorite impacts, and acid rain. Each event’s codes include designations for initial treatment, follow-up care, and long-term sequela, ensuring precise coding for environmental injuries and exposures.
Questions About This Page
How many codes are in the X30-X39 range?
The X30-X39 range contains 85 ICD-10-CM diagnosis codes in FY 2026. 60 of them are billable, and the rest are category headers that organize the section.
What conditions does X30-X39 cover?
The range covers exposure to forces of nature. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
