T42
Header — not billablePoisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
The ICD-10 code for poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs is T42.
T42 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 9 more specific codes below.
Clinical notes
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
7th character definitions
These definitions specify what each valid 7th-character value means for codes in this category.
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7th character note
This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.
- The appropriate 7th character is to be added to each code from category T42
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under T42
- T42.0Poisoning by, adverse effect of and underdosing of hydantoin derivativesnon-billable header
- T42.1Poisoning by, adverse effect of and underdosing of iminostilbenesnon-billable header
- T42.2Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinedionesnon-billable header
- T42.3Poisoning by, adverse effect of and underdosing of barbituratesnon-billable header
- T42.4Poisoning by, adverse effect of and underdosing of benzodiazepinesnon-billable header
- T42.5Poisoning by, adverse effect of and underdosing of mixed antiepilepticsnon-billable header
- T42.6Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugsnon-billable header
- T42.7Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugsnon-billable header
- T42.8Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantsnon-billable header
Related codes in this category
- T36Poisoning by, adverse effect of and underdosing of systemic antibioticsnon-billable header
- T37Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasiticsnon-billable header
- T38Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classifiednon-billable header
- T39Poisoning by, adverse effect of and underdosing of nonopioid analgesics, antipyretics and antirheumaticsnon-billable header
- T40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]non-billable header
- T41Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gasesnon-billable header
- T43Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classifiednon-billable header
- T44Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous systemnon-billable header
- T45Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classifiednon-billable header
- T46Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular systemnon-billable header
- T47Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal systemnon-billable header
- T48Poisoning by, adverse effect of and underdosing of agents primarily acting on smooth and skeletal muscles and the respiratory systemnon-billable header
- T49Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugsnon-billable header
- T50Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substancesnon-billable header
- T42Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugsnon-billable header