ICD-10-CM diagnosis code
T65.823S Toxic effect of harmful algae and algae toxins, assault, 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 T65
180 complete codes in this category.
- T65.821SToxic effect of harmful algae and algae toxins, accidental (unintentional), sequela
- T65.822AToxic effect of harmful algae and algae toxins, intentional self-harm, initial encounter
- T65.822DToxic effect of harmful algae and algae toxins, intentional self-harm, subsequent encounter
- T65.822SToxic effect of harmful algae and algae toxins, intentional self-harm, sequela
- T65.823AToxic effect of harmful algae and algae toxins, assault, initial encounter
- T65.823DToxic effect of harmful algae and algae toxins, assault, subsequent encounter
- T65.823SToxic effect of harmful algae and algae toxins, assault, sequela
- T65.824AToxic effect of harmful algae and algae toxins, undetermined, initial encounter
- T65.824DToxic effect of harmful algae and algae toxins, undetermined, subsequent encounter
- T65.824SToxic effect of harmful algae and algae toxins, undetermined, sequela
- T65.831AToxic effect of fiberglass, accidental (unintentional), initial encounter
- T65.831DToxic effect of fiberglass, accidental (unintentional), subsequent encounter
Documentation tips
- Make sure the note supports every element of the title, “Toxic effect of harmful algae and algae toxins, assault, 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 T65.
The international WHO ICD-10 also has T65, 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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