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ICD-10-CM · FY 2026 APRIL UPDATE

T43.0

Poisoning by, adverse effect of and underdosing of tricyclic and tetracyclic antidepressants

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

CODEDESCRIPTIONTYPE
T43.01Poisoning by, adverse effect of and underdosing of tricyclic antidepressantsCategory
T43.011Poisoning by tricyclic antidepressants, accidental (unintentional)Category
T43.011APoisoning by tricyclic antidepressants, accidental (unintentional), initial encounterBillable
T43.011DPoisoning by tricyclic antidepressants, accidental (unintentional), subsequent encounterBillable
T43.011SPoisoning by tricyclic antidepressants, accidental (unintentional), sequelaBillable
T43.012Poisoning by tricyclic antidepressants, intentional self-harmCategory
T43.012APoisoning by tricyclic antidepressants, intentional self-harm, initial encounterBillable
T43.012DPoisoning by tricyclic antidepressants, intentional self-harm, subsequent encounterBillable
T43.012SPoisoning by tricyclic antidepressants, intentional self-harm, sequelaBillable
T43.013Poisoning by tricyclic antidepressants, assaultCategory
T43.013APoisoning by tricyclic antidepressants, assault, initial encounterBillable
T43.013DPoisoning by tricyclic antidepressants, assault, subsequent encounterBillable
T43.013SPoisoning by tricyclic antidepressants, assault, sequelaBillable
T43.014Poisoning by tricyclic antidepressants, undeterminedCategory
T43.014APoisoning by tricyclic antidepressants, undetermined, initial encounterBillable
T43.014DPoisoning by tricyclic antidepressants, undetermined, subsequent encounterBillable
T43.014SPoisoning by tricyclic antidepressants, undetermined, sequelaBillable
T43.015Adverse effect of tricyclic antidepressantsCategory
T43.015AAdverse effect of tricyclic antidepressants, initial encounterBillable
T43.015DAdverse effect of tricyclic antidepressants, subsequent encounterBillable
T43.015SAdverse effect of tricyclic antidepressants, sequelaBillable
T43.016Underdosing of tricyclic antidepressantsCategory
T43.016AUnderdosing of tricyclic antidepressants, initial encounterBillable
T43.016DUnderdosing of tricyclic antidepressants, subsequent encounterBillable
T43.016SUnderdosing of tricyclic antidepressants, sequelaBillable
T43.02Poisoning by, adverse effect of and underdosing of tetracyclic antidepressantsCategory
T43.021Poisoning by tetracyclic antidepressants, accidental (unintentional)Category
T43.021APoisoning by tetracyclic antidepressants, accidental (unintentional), initial encounterBillable
T43.021DPoisoning by tetracyclic antidepressants, accidental (unintentional), subsequent encounterBillable
T43.021SPoisoning by tetracyclic antidepressants, accidental (unintentional), sequelaBillable

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.