Back to ICD-10 library
ICD-10-CM · FY 2026 APRIL UPDATE

T42.6X

Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs

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
T42.6X1Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional)Category
T42.6X1APoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounterBillable
T42.6X1DPoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounterBillable
T42.6X1SPoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequelaBillable
T42.6X2Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harmCategory
T42.6X2APoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounterBillable
T42.6X2DPoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounterBillable
T42.6X2SPoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequelaBillable
T42.6X3Poisoning by other antiepileptic and sedative-hypnotic drugs, assaultCategory
T42.6X3APoisoning by other antiepileptic and sedative-hypnotic drugs, assault, initial encounterBillable
T42.6X3DPoisoning by other antiepileptic and sedative-hypnotic drugs, assault, subsequent encounterBillable
T42.6X3SPoisoning by other antiepileptic and sedative-hypnotic drugs, assault, sequelaBillable
T42.6X4Poisoning by other antiepileptic and sedative-hypnotic drugs, undeterminedCategory
T42.6X4APoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, initial encounterBillable
T42.6X4DPoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounterBillable
T42.6X4SPoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, sequelaBillable
T42.6X5Adverse effect of other antiepileptic and sedative-hypnotic drugsCategory
T42.6X5AAdverse effect of other antiepileptic and sedative-hypnotic drugs, initial encounterBillable
T42.6X5DAdverse effect of other antiepileptic and sedative-hypnotic drugs, subsequent encounterBillable
T42.6X5SAdverse effect of other antiepileptic and sedative-hypnotic drugs, sequelaBillable
T42.6X6Underdosing of other antiepileptic and sedative-hypnotic drugsCategory
T42.6X6AUnderdosing of other antiepileptic and sedative-hypnotic drugs, initial encounterBillable
T42.6X6DUnderdosing of other antiepileptic and sedative-hypnotic drugs, subsequent encounterBillable
T42.6X6SUnderdosing of other antiepileptic and sedative-hypnotic drugs, 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.