ICD-10-CM Book 2026 Edition

Chapters  /  Chapter 20  /  X30-X39

Exposure to forces of nature (X30-X39)

X30 Exposure to excessive natural heat
Exposure to excessive heat as the cause of sunstroke
Exposure to heat NOS
Excludes1 excessive heat of man-made origin (W92)
exposure to man-made radiation (W89)
exposure to sunlight (X32)
exposure to tanning bed (W89)
char7Note The appropriate 7th character is to be added to code X30
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X31 Exposure to excessive natural cold
Excessive cold as the cause of chilblains NOS
Excessive cold as the cause of immersion foot or hand
Exposure to cold NOS
Exposure to weather conditions
Excludes1 cold of man-made origin (W93.-)
contact with or inhalation of dry ice (W93.-)
contact with or inhalation of liquefied gas (W93.-)
char7Note The appropriate 7th character is to be added to code X31
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X32 Exposure to sunlight
Excludes1 man-made radiation (tanning bed) (W89)
Excludes2 radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
char7Note The appropriate 7th character is to be added to code X32
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X34 Earthquake
Excludes2 tidal wave (tsunami) due to earthquake (X37.41)
char7Note The appropriate 7th character is to be added to code X34
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X35 Volcanic eruption
Excludes2 tidal wave (tsunami) due to volcanic eruption (X37.41)
char7Note The appropriate 7th character is to be added to code X35
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X36 Avalanche, landslide and other earth movements
Includes victim of mudslide of cataclysmic nature
Excludes1 earthquake (X34)
Excludes2 transport accident involving collision with avalanche or landslide not in motion (V01-V99)
char7Note The appropriate 7th character is to be added to each code from category X36
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X36.0 Collapse of dam or man-made structure causing earth movement
X36.1 Avalanche, landslide, or mudslide
X37 Cataclysmic storm
char7Note The appropriate 7th character is to be added to each code from category X37
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X37.0 Hurricane
Storm surge
Typhoon
X37.1 Tornado
Cyclone
Twister
X37.2 Blizzard (snow)(ice)
X37.3 Dust storm
X37.4 Tidalwave
X37.41 Tidal wave due to earthquake or volcanic eruption
Tidal wave NOS
Tsunami
X37.42 Tidal wave due to storm
X37.43 Tidal wave due to landslide
X37.8 Other cataclysmic storms
Cloudburst
Torrential rain
Excludes2 flood (X38)
X37.9 Unspecified cataclysmic storm
Storm NOS
Excludes1 collapse of dam or man-made structure causing earth movement (X36.0)
X38 Flood
Flood arising from remote storm
Flood of cataclysmic nature arising from melting snow
Flood resulting directly from storm
Excludes1 collapse of dam or man-made structure causing earth movement (X36.0)
tidal wave NOS (X37.41)
tidal wave caused by storm (X37.42)
char7Note The appropriate 7th character is to be added to code X38
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X39 Exposure to other forces of nature
char7Note The appropriate 7th character is to be added to each code from category X39
char7Def A: initial encounter
D: subsequent encounter
S: sequela
X39.0 Exposure to natural radiation
Excludes1 contact with and (suspected) exposure to radon and other naturally occurring radiation (Z77.123)
exposure to man-made radiation (W88-W90)
exposure to sunlight (X32)
X39.01 Exposure to radon
X39.08 Exposure to other natural radiation
X39.8 Other exposure to forces of nature