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ICD-10-CM · FY 2026 APRIL UPDATE

T42.4

Poisoning by, adverse effect of and underdosing of benzodiazepines

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
T42.4XPoisoning by, adverse effect of and underdosing of benzodiazepinesCategory
T42.4X1Poisoning by benzodiazepines, accidental (unintentional)Category
T42.4X1APoisoning by benzodiazepines, accidental (unintentional), initial encounterBillable
T42.4X1DPoisoning by benzodiazepines, accidental (unintentional), subsequent encounterBillable
T42.4X1SPoisoning by benzodiazepines, accidental (unintentional), sequelaBillable
T42.4X2Poisoning by benzodiazepines, intentional self-harmCategory
T42.4X2APoisoning by benzodiazepines, intentional self-harm, initial encounterBillable
T42.4X2DPoisoning by benzodiazepines, intentional self-harm, subsequent encounterBillable
T42.4X2SPoisoning by benzodiazepines, intentional self-harm, sequelaBillable
T42.4X3Poisoning by benzodiazepines, assaultCategory
T42.4X3APoisoning by benzodiazepines, assault, initial encounterBillable
T42.4X3DPoisoning by benzodiazepines, assault, subsequent encounterBillable
T42.4X3SPoisoning by benzodiazepines, assault, sequelaBillable
T42.4X4Poisoning by benzodiazepines, undeterminedCategory
T42.4X4APoisoning by benzodiazepines, undetermined, initial encounterBillable
T42.4X4DPoisoning by benzodiazepines, undetermined, subsequent encounterBillable
T42.4X4SPoisoning by benzodiazepines, undetermined, sequelaBillable
T42.4X5Adverse effect of benzodiazepinesCategory
T42.4X5AAdverse effect of benzodiazepines, initial encounterBillable
T42.4X5DAdverse effect of benzodiazepines, subsequent encounterBillable
T42.4X5SAdverse effect of benzodiazepines, sequelaBillable
T42.4X6Underdosing of benzodiazepinesCategory
T42.4X6AUnderdosing of benzodiazepines, initial encounterBillable
T42.4X6DUnderdosing of benzodiazepines, subsequent encounterBillable
T42.4X6SUnderdosing of benzodiazepines, 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.