ICD-10-CM diagnosis code
T59.4X1S Toxic effect of chlorine gas, accidental (unintentional), sequela
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for a sequela: a complication or condition that arises as a direct result of the injury. The sequela itself is usually coded first, followed by this code.
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Other codes in T59
132 complete codes in this category.
- T59.3X3SToxic effect of lacrimogenic gas, assault, sequela
- T59.3X4AToxic effect of lacrimogenic gas, undetermined, initial encounter
- T59.3X4DToxic effect of lacrimogenic gas, undetermined, subsequent encounter
- T59.3X4SToxic effect of lacrimogenic gas, undetermined, sequela
- T59.4X1AToxic effect of chlorine gas, accidental (unintentional), initial encounter
- T59.4X1DToxic effect of chlorine gas, accidental (unintentional), subsequent encounter
- T59.4X1SToxic effect of chlorine gas, accidental (unintentional), sequela
- T59.4X2AToxic effect of chlorine gas, intentional self-harm, initial encounter
- T59.4X2DToxic effect of chlorine gas, intentional self-harm, subsequent encounter
- T59.4X2SToxic effect of chlorine gas, intentional self-harm, sequela
- T59.4X3AToxic effect of chlorine gas, assault, initial encounter
- T59.4X3DToxic effect of chlorine gas, assault, subsequent encounter
Documentation tips
- Make sure the note supports every element of the title, “Toxic effect of chlorine gas, accidental (unintentional), sequela”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to T59.
The international WHO ICD-10 also has T59, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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