T65.821

Billable
ChapterS00–T88
Ranksubcategory
Official Description

Toxic effect of harmful algae and algae toxins, accidental (unintentional)

Metadata & Insights
  • Billable/specific code (valid for reimbursement).
  • Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Instructional Notes

Includes
  • Toxic effect of harmful algae and algae toxins NOS
General instructions are available for the parent sections:

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T51-T65Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
T65Toxic effect of other and unspecified substances
T65.8Toxic effect of other specified substances
T65.82Toxic effect of harmful algae and algae toxins
T65.821Toxic effect of harmful algae and algae toxins, accidental (unintentional)Billable
T65.821AToxic effect of harmful algae and algae toxins, accidental (unintentional), initial encounterBillable
T65.821DToxic effect of harmful algae and algae toxins, accidental (unintentional), subsequent encounterBillable
T65.821SToxic effect of harmful algae and algae toxins, accidental (unintentional), sequelaBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to T65.821:

subcategoryT65.82
Toxic effect of harmful algae and algae toxins
View context instructions
blockT51-T65
Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
View context instructions
chapterCH19
Injury, poisoning and certain other consequences of external causes (S00-T88)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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