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ICD-10-CM · FY 2026 APRIL UPDATE

T42.5X

Poisoning by, adverse effect of and underdosing of antiepileptics

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
T42.5X1Poisoning by mixed antiepileptics, accidental (unintentional)Category
T42.5X1APoisoning by mixed antiepileptics, accidental (unintentional), initial encounterBillable
T42.5X1DPoisoning by mixed antiepileptics, accidental (unintentional), subsequent encounterBillable
T42.5X1SPoisoning by mixed antiepileptics, accidental (unintentional), sequelaBillable
T42.5X2Poisoning by mixed antiepileptics, intentional self-harmCategory
T42.5X2APoisoning by mixed antiepileptics, intentional self-harm, initial encounterBillable
T42.5X2DPoisoning by mixed antiepileptics, intentional self-harm, subsequent encounterBillable
T42.5X2SPoisoning by mixed antiepileptics, intentional self-harm, sequelaBillable
T42.5X3Poisoning by mixed antiepileptics, assaultCategory
T42.5X3APoisoning by mixed antiepileptics, assault, initial encounterBillable
T42.5X3DPoisoning by mixed antiepileptics, assault, subsequent encounterBillable
T42.5X3SPoisoning by mixed antiepileptics, assault, sequelaBillable
T42.5X4Poisoning by mixed antiepileptics, undeterminedCategory
T42.5X4APoisoning by mixed antiepileptics, undetermined, initial encounterBillable
T42.5X4DPoisoning by mixed antiepileptics, undetermined, subsequent encounterBillable
T42.5X4SPoisoning by mixed antiepileptics, undetermined, sequelaBillable
T42.5X5Adverse effect of mixed antiepilepticsCategory
T42.5X5AAdverse effect of mixed antiepileptics, initial encounterBillable
T42.5X5DAdverse effect of mixed antiepileptics, subsequent encounterBillable
T42.5X5SAdverse effect of mixed antiepileptics, sequelaBillable
T42.5X6Underdosing of mixed antiepilepticsCategory
T42.5X6AUnderdosing of mixed antiepileptics, initial encounterBillable
T42.5X6DUnderdosing of mixed antiepileptics, subsequent encounterBillable
T42.5X6SUnderdosing of mixed antiepileptics, 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.