X38 Flood
The ICD-10-CM code for Flood is X38 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- X30-X39: Exposure to forces of nature (X30-X39)
- Category X38
- 1 code (1 billable)
- FY2026 Status
- Stable since FY2024
Inclusion Terms
- Flood arising from remote storm
- Flood of cataclysmic nature arising from melting snow
- Flood resulting directly from storm
Official Coding Guidelines
Sequencing—external causes for hurricane-related injuriesb. Sequencing of External Causes of Morbidity Codes Codes for cataclysmic events, such as a hurricane, take priority over all other external cause codes except child and adult abuse and terrorism and should be sequenced before other external cause of injury codes. Assign as many external cause of morbidity codes as necessary to fully explain each cause. For example, if an injury occurs as a result of a building collapse during the hurricane, external cause codes for both the hurricane and the building collapse should be assigned, with the external causes code for hurricane being sequenced as the first external cause code. For injuries incurred as a direct result of the hurricane, assign the appropriate code(s) for the injuries, followed by the code X37.0-, Hurricane (with the appropriate 7th character), and any other applicable external cause of injury codes. Code X37.0- also should be assigned when an injury is incurred as a result of flooding caused by a levee breaking related to the hurricane. Code X38.-, Flood (with the appropriate 7th character), should be assigned when an injury is from flooding resulting directly from the storm. Code X36.0.-, Collapse of dam or man- made structure, should not be assigned when the cause of the collapse is due to the hurricane. Use of code X36.0- is limited to collapses of man-made structures due to earth surface movements, not due to storm surges directly from a hurricane.
Other external cause issues—when not direct hurricane resultc. Other External Causes of Morbidity Code Issues For injuries that are not a direct result of the hurricane, such as an evacuee that has incurred an injury as a result of a motor vehicle accident, assign the appropriate external cause of morbidity code(s) to describe the cause of the injury, but do not assign code X37.0-, Hurricane. If it is not clear whether the injury was a direct result of the hurricane, assume the injury is due to the hurricane and assign code X37.0-, Hurricane, as well as any other applicable external cause of morbidity codes. In addition to code X37.0-, Hurricane, other possible applicable external cause of morbidity codes include: X30-, Exposure to excessive natural heat X31-, Exposure to excessive natural cold X38-, Flood
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026