T42 ICD-10-CA category: Poisoning by antiepileptic, sedative-hypnotic and antiparkinsonism drugs
T42 isn’t a code on its own. Choose one of the 9 codes beneath it, the one the documentation supports.
Official description
T42Poisoning by antiepileptic, sedative-hypnotic and antiparkinsonism drugs
ICD-10-CA · Canada
Codes in T42
T42 isn’t a code on its own. Open the code that matches what the note documents.
T42.0Poisoning by hydantoin derivativesT42.1Poisoning by iminostilbenesT42.2Poisoning by succinimides and oxazolidinedionesT42.3Poisoning by barbituratesT42.4Poisoning by benzodiazepinesT42.5Poisoning by mixed antiepileptics, not elsewhere classifiedT42.6Poisoning by other antiepileptic and sedative-hypnotic drugsT42.7Poisoning by antiepileptic and sedative-hypnotic drugs, unspecifiedT42.8Poisoning by antiparkinsonism drugs and other central muscle-tone depressantsNotes for T42
As CIHI prints them, with any note T42 takes from the headings above it.
Includes
- Overdose of these substanceswrong substance given or taken in errorFrom T36-T50 Poisoning by drugs, medicaments and biological substances
Excludes
Conditions classified elsewhere.
- Intoxication meaning inebriation (F10-F19)
- Abuse of non-dependence-producing substances (F55)adverse effects ["hypersensitivity", "reaction", etc.] of correct substance properly administered; such cases are to be classified according to the nature of the adverse effect, such as:• aspirin gastritis (K29.-)• blood disorders (D50-D76)• dermatitis• contact (L23-L25)• due to substances taken internally (L27.-)• nephropathy (N14.0-N14.2)• unspecified adverse effect of drug (T88.7)drug:• intoxication meaning inebriation (F10-F19)• reaction and poisoning affecting the fetus and newborn (P00-P96)pathological drug intoxication (F10-F19)From T36-T50 Poisoning by drugs, medicaments and biological substances
- Birth trauma (P10-P15)obstetric trauma (O70-O71)From Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Note
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to multiple or unspecified body regions as well as poisoning and certain other consequences of external causes.Where multiple sites of injury are specified in the titles, the word "with" indicates involvement of both sites, and the word "and" indicates involvement of either or both sites.The principle of multiple coding of injuries should be followed wherever possible.Combination categories for multiple injuries is provided for use when there are insufficient detail as to the nature of the individual conditions, or for primary tabulation purposes when it is more convenient to record single code; otherwise, the component injuries should be coded separately.Reference should also be made to the coding rules and guidelines.The blocks of the S-section as well as (T00-T14 and T90-T98) contain injuries at the three-character level classified by type as follows:Superficial injury including:abrasionblister (nonthermal)contusion, including bruise and haematomainjury from superficial foreign body (splinter) without major open woundinsect bite (nonvenomous)Open wound including:animal bitecutlacerationpuncture wound:• NOS• with (penetrating) foreign bodyFracture including:Fracture:closed: comminuted, depressed, elevated, fissured, greenstick, impacted, linear, simple, slipped epiphysis, spiral — with or without delayed healingdislocateddisplacedFracture:open: compound, infected, missile, puncture, with foreign body — with or without delayed healingExcludes:malunion of fracture (M84.0)nonunion of fracture [pseudoarthrosis] (M84.1)pathological fracture (M84.4):• with osteoporosis (M80.-)stress fracture (M84.3)Dislocation, sprain and strain including:avulsion, laceration, sprain, strain, traumatic: haemarthosis, rupture, subluxation, tear of cartilage, joint (capsule), ligamentInjury to nerves and spinal cord including:complete or incomplete lesion of spinal cordlesion incontinuity of nerves and spinal cordtraumatic:• division of nerve• haematomyelia• paralysis (transient)• paraplegia• quadriplegiaInjury to blood vessels includingavulsion, cut, laceration, traumatic: aneurysm or fistula (arteriovenous), arterial haematoma, rupture of blood vesselsInjury of muscle, fascia and tendon including:avulsion, cut, laceration, strain, traumatic rupture of muscle, fascia and tendonCrushing InjuryTraumatic amputationInjury to internal organs including:blast injuries, bruise, concussion injuries, crushing, laceration, traumatic: haematoma, puncture, rupture, tear of internal organsOther and unspecified injuriesFrom Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Where T42 sits
- 1ChapterChapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
- 2Block T36-T50Poisoning by drugs, medicaments and biological substances
- 3Category T42Poisoning by antiepileptic, sedative-hypnotic and antiparkinsonism drugs
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is T42 a valid ICD-10-CA code?
No. T42 (Poisoning by antiepileptic, sedative-hypnotic and antiparkinsonism drugs) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 9 codes; record the one the documentation supports.
Where is T42 in ICD-10-CA?
T42 sits under T36-T50 Poisoning by drugs, medicaments and biological substances, within Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98).
What coding notes apply to T42?
ICD-10-CA lists Excludes, Includes, Note notes for T42, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside T42
View T36-T50T36Poisoning by systemic antibioticsT37Poisoning by other systemic anti-infectives and antiparasiticsT38Poisoning by hormones and their synthetic substitutes and antagonists, not elsewhere classifiedT39Poisoning by nonopioid analgesics, antipyretics and antirheumaticsT40Poisoning by narcotics and psychodysleptics [hallucinogens]T41Poisoning by anaesthetics and therapeutic gasesT43Poisoning by psychotropic drugs, not elsewhere classifiedT44Poisoning by drugs primarily affecting the autonomic nervous systemT45Poisoning by primarily systemic and haematological agents, not elsewhere classifiedT46Poisoning by agents primarily affecting the cardiovascular systemT47Poisoning by agents primarily affecting the gastrointestinal systemT48Poisoning by agents primarily acting on smooth and skeletal muscles and the respiratory systemT49Poisoning by topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinolaryngological and dental drugsT50Poisoning by diuretics and other and unspecified drugs, medicaments and biological substances