ICD-10-CM diagnosis code
T40.495S Adverse effect of other synthetic narcotics, 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 T40
258 complete codes in this category.
- T40.493SPoisoning by other synthetic narcotics, assault, sequela
- T40.494APoisoning by other synthetic narcotics, undetermined, initial encounter
- T40.494DPoisoning by other synthetic narcotics, undetermined, subsequent encounter
- T40.494SPoisoning by other synthetic narcotics, undetermined, sequela
- T40.495AAdverse effect of other synthetic narcotics, initial encounter
- T40.495DAdverse effect of other synthetic narcotics, subsequent encounter
- T40.495SAdverse effect of other synthetic narcotics, sequela
- T40.496AUnderdosing of other synthetic narcotics, initial encounter
- T40.496DUnderdosing of other synthetic narcotics, subsequent encounter
- T40.496SUnderdosing of other synthetic narcotics, sequela
- T40.5X1APoisoning by cocaine, accidental (unintentional), initial encounter
- T40.5X1DPoisoning by cocaine, accidental (unintentional), subsequent encounter
Documentation tips
- Make sure the note supports every element of the title, “Adverse effect of other synthetic narcotics, 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 T40.
The international WHO ICD-10 also has T40, 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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