Is T42.5X a billable code?
No. T42.5X is a header code that groups 18 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
T42.5X: Poisoning by, adverse effect of and underdosing of antiepileptics
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
T42.5X groups related diagnoses under poisoning by, adverse effect of and underdosing of antiepileptics. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under T42.5X
- T42.5X1APoisoning by mixed antiepileptics, accidental (unintentional), initial encounter
- T42.5X1DPoisoning by mixed antiepileptics, accidental (unintentional), subsequent encounter
- T42.5X1SPoisoning by mixed antiepileptics, accidental (unintentional), sequela
- T42.5X2APoisoning by mixed antiepileptics, intentional self-harm, initial encounter
- T42.5X2DPoisoning by mixed antiepileptics, intentional self-harm, subsequent encounter
- T42.5X2SPoisoning by mixed antiepileptics, intentional self-harm, sequela
- T42.5X3APoisoning by mixed antiepileptics, assault, initial encounter
- T42.5X3DPoisoning by mixed antiepileptics, assault, subsequent encounter
- T42.5X3SPoisoning by mixed antiepileptics, assault, sequela
- T42.5X4APoisoning by mixed antiepileptics, undetermined, initial encounter
- T42.5X4DPoisoning by mixed antiepileptics, undetermined, subsequent encounter
- T42.5X4SPoisoning by mixed antiepileptics, undetermined, sequela
- T42.5X5AAdverse effect of mixed antiepileptics, initial encounter
- T42.5X5DAdverse effect of mixed antiepileptics, subsequent encounter
- T42.5X5SAdverse effect of mixed antiepileptics, sequela
- T42.5X6AUnderdosing of mixed antiepileptics, initial encounter
- T42.5X6DUnderdosing of mixed antiepileptics, subsequent encounter
- T42.5X6SUnderdosing of mixed antiepileptics, sequela
T42.5X questions
What does T42.5X mean?
T42.5X is the ICD-10-CM code for Poisoning by, adverse effect of and underdosing of antiepileptics. It is in chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.