T65.82

Toxic effect of harmful algae and algae toxins

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027

SourceCMS ICD-10-CM order file

ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODE	DESCRIPTION	TYPE
T65.821	Toxic effect of harmful algae and algae toxins, accidental (unintentional)	Category
T65.821A	Toxic effect of harmful algae and algae toxins, accidental (unintentional), initial encounter	Billable
T65.821D	Toxic effect of harmful algae and algae toxins, accidental (unintentional), subsequent encounter	Billable
T65.821S	Toxic effect of harmful algae and algae toxins, accidental (unintentional), sequela	Billable
T65.822	Toxic effect of harmful algae and algae toxins, intentional self-harm	Category
T65.822A	Toxic effect of harmful algae and algae toxins, intentional self-harm, initial encounter	Billable
T65.822D	Toxic effect of harmful algae and algae toxins, intentional self-harm, subsequent encounter	Billable
T65.822S	Toxic effect of harmful algae and algae toxins, intentional self-harm, sequela	Billable
T65.823	Toxic effect of harmful algae and algae toxins, assault	Category
T65.823A	Toxic effect of harmful algae and algae toxins, assault, initial encounter	Billable
T65.823D	Toxic effect of harmful algae and algae toxins, assault, subsequent encounter	Billable
T65.823S	Toxic effect of harmful algae and algae toxins, assault, sequela	Billable
T65.824	Toxic effect of harmful algae and algae toxins, undetermined	Category
T65.824A	Toxic effect of harmful algae and algae toxins, undetermined, initial encounter	Billable
T65.824D	Toxic effect of harmful algae and algae toxins, undetermined, subsequent encounter	Billable
T65.824S	Toxic effect of harmful algae and algae toxins, undetermined, sequela	Billable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.