X30-X39Not billable, use a more specific code below
Exposure to forces of nature (X30-X39)
chapter 20: External Causes of Morbidity
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.
- General External Cause Coding Guidelines (page 88)
- Place of Occurrence Guideline (page 89)
- Activity Code (page 89)
- Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
- If the Reporting Format Limits the Number of External Cause Codes (page 90)
- Multiple External Cause Coding Guidelines (page 90)
- Child and Adult Abuse Guideline (page 90)
- Unknown or Undetermined Intent Guideline (page 91)
All codes under X30-X39
X30-X39 can't be used on a claim. Pick a billable code below; grey headings group them.
- X30Exposure to excessive natural heat
- X30.XXXAExposure to excessive natural heat, initial encounter
- X30.XXXDExposure to excessive natural heat, subsequent encounter
- X30.XXXSExposure to excessive natural heat, sequela
- X31Exposure to excessive natural cold
- X31.XXXAExposure to excessive natural cold, initial encounter
- X31.XXXDExposure to excessive natural cold, subsequent encounter
- X31.XXXSExposure to excessive natural cold, sequela
- X32Exposure to sunlight
- X32.XXXAExposure to sunlight, initial encounter
- X32.XXXDExposure to sunlight, subsequent encounter
- X32.XXXSExposure to sunlight, sequela
- X34Earthquake
- X34.XXXAEarthquake, initial encounter
- X34.XXXDEarthquake, subsequent encounter
- X34.XXXSEarthquake, sequela
- X35Volcanic eruption
- X35.XXXAVolcanic eruption, initial encounter
- X35.XXXDVolcanic eruption, subsequent encounter
- X35.XXXSVolcanic eruption, sequela
- X36Avalanche, landslide and other earth movements
- X36.0Collapse of dam or man-made structure causing earth movement
- X36.0XXACollapse of dam or man-made structure causing earth movement, initial encounter
- X36.0XXDCollapse of dam or man-made structure causing earth movement, subsequent encounter
- X36.0XXSCollapse of dam or man-made structure causing earth movement, sequela
- X36.1Avalanche, landslide, or mudslide
- X36.1XXAAvalanche, landslide, or mudslide, initial encounter
- X36.1XXDAvalanche, landslide, or mudslide, subsequent encounter
- X36.1XXSAvalanche, landslide, or mudslide, sequela
- X37Cataclysmic storm
- X37.0Hurricane
- X37.0XXAHurricane, initial encounter
- X37.0XXDHurricane, subsequent encounter
- X37.0XXSHurricane, sequela
- X37.1Tornado
- X37.1XXATornado, initial encounter
- X37.1XXDTornado, subsequent encounter
- X37.1XXSTornado, sequela
- X37.2Blizzard (snow)(ice)
- X37.2XXABlizzard (snow)(ice), initial encounter
- X37.2XXDBlizzard (snow)(ice), subsequent encounter
- X37.2XXSBlizzard (snow)(ice), sequela
- X37.3Dust storm
- X37.3XXADust storm, initial encounter
- X37.3XXDDust storm, subsequent encounter
- X37.3XXSDust storm, sequela
- X37.4Tidalwave
- X37.41Tidal wave due to earthquake or volcanic eruption
- X37.41XATidal wave due to earthquake or volcanic eruption, initial encounter
- X37.41XDTidal wave due to earthquake or volcanic eruption, subsequent encounter
- X37.41XSTidal wave due to earthquake or volcanic eruption, sequela
- X37.42Tidal wave due to storm
- X37.42XATidal wave due to storm, initial encounter
- X37.42XDTidal wave due to storm, subsequent encounter
- X37.42XSTidal wave due to storm, sequela
- X37.43Tidal wave due to landslide
- X37.43XATidal wave due to landslide, initial encounter
- X37.43XDTidal wave due to landslide, subsequent encounter
- X37.43XSTidal wave due to landslide, sequela
- X37.8Other cataclysmic storms
- X37.8XXAOther cataclysmic storms, initial encounter
- X37.8XXDOther cataclysmic storms, subsequent encounter
- X37.8XXSOther cataclysmic storms, sequela
- X37.9Unspecified cataclysmic storm
- X37.9XXAUnspecified cataclysmic storm, initial encounter
- X37.9XXDUnspecified cataclysmic storm, subsequent encounter
- X37.9XXSUnspecified cataclysmic storm, sequela
- X38Flood
- X38.XXXAFlood, initial encounter
- X38.XXXDFlood, subsequent encounter
- X38.XXXSFlood, sequela
- X39Exposure to other forces of nature
- X39.0Exposure to natural radiation
- X39.01Exposure to radon
- X39.01XAExposure to radon, initial encounter
- X39.01XDExposure to radon, subsequent encounter
- X39.01XSExposure to radon, sequela
- X39.08Exposure to other natural radiation
- X39.08XAExposure to other natural radiation, initial encounter
- X39.08XDExposure to other natural radiation, subsequent encounter
- X39.08XSExposure to other natural radiation, sequela
- X39.8Other exposure to forces of nature
- X39.8XXAOther exposure to forces of nature, initial encounter
- X39.8XXDOther exposure to forces of nature, subsequent encounter
- X39.8XXSOther exposure to forces of nature, sequela
X30-X39 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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 more about heat illness on MedlinePlus