T42
⚠ Non-billable
Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes
Code
T42
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code T42?
ICD-10-CM code T42 represents Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs. It is a non-billable header code requiring a more specific subcategory in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is T42 billable?
No. T42 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is T42 in?
T42 belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.
Related codes in the T42 category
T42.0
Poisoning by, adverse effect of and underdosing of hydantoin derivatives
Non-billable
T42.1
Poisoning by, adverse effect of and underdosing of iminostilbenes
Non-billable
T42.0X
Poisoning by, adverse effect of and underdosing of hydantoin derivatives
Non-billable
T42.1X
Poisoning by, adverse effect of and underdosing of iminostilbenes
Non-billable
T42.0X1
Poisoning by hydantoin derivatives, accidental (unintentional)
Non-billable
T42.0X2
Poisoning by hydantoin derivatives, intentional self-harm
Non-billable
T42.0X3
Poisoning by hydantoin derivatives, assault
Non-billable
T42.0X4
Poisoning by hydantoin derivatives, undetermined
Non-billable
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