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ICD-10-CM · FY 2026 APRIL UPDATE

T43.02

Poisoning by, adverse effect of and underdosing of 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
T43.021Poisoning 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
T43.022Poisoning by tetracyclic antidepressants, intentional self-harmCategory
T43.022APoisoning by tetracyclic antidepressants, intentional self-harm, initial encounterBillable
T43.022DPoisoning by tetracyclic antidepressants, intentional self-harm, subsequent encounterBillable
T43.022SPoisoning by tetracyclic antidepressants, intentional self-harm, sequelaBillable
T43.023Poisoning by tetracyclic antidepressants, assaultCategory
T43.023APoisoning by tetracyclic antidepressants, assault, initial encounterBillable
T43.023DPoisoning by tetracyclic antidepressants, assault, subsequent encounterBillable
T43.023SPoisoning by tetracyclic antidepressants, assault, sequelaBillable
T43.024Poisoning by tetracyclic antidepressants, undeterminedCategory
T43.024APoisoning by tetracyclic antidepressants, undetermined, initial encounterBillable
T43.024DPoisoning by tetracyclic antidepressants, undetermined, subsequent encounterBillable
T43.024SPoisoning by tetracyclic antidepressants, undetermined, sequelaBillable
T43.025Adverse effect of tetracyclic antidepressantsCategory
T43.025AAdverse effect of tetracyclic antidepressants, initial encounterBillable
T43.025DAdverse effect of tetracyclic antidepressants, subsequent encounterBillable
T43.025SAdverse effect of tetracyclic antidepressants, sequelaBillable
T43.026Underdosing of tetracyclic antidepressantsCategory
T43.026AUnderdosing of tetracyclic antidepressants, initial encounterBillable
T43.026DUnderdosing of tetracyclic antidepressants, subsequent encounterBillable
T43.026SUnderdosing of tetracyclic antidepressants, 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.