All ICD10 Codes

T42

Non-Billable
ChapterS00–T88
Rankcategory
Official Description

Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs

Use a more specific code (0 billable, 9 non-billable)
T42.0Poisoning by, adverse effect of and underdosing of hydantoin derivativeshas subcodesT42.1Poisoning by, adverse effect of and underdosing of iminostilbeneshas subcodesT42.2Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinedioneshas subcodesT42.3Poisoning by, adverse effect of and underdosing of barbiturateshas subcodesT42.4Poisoning by, adverse effect of and underdosing of benzodiazepineshas subcodesT42.5Poisoning by, adverse effect of and underdosing of mixed antiepilepticshas subcodesT42.6Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugshas subcodesT42.7Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugshas subcodesT42.8Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantshas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)

T36-T50 Parent Instructions

Includes
  • adverse effect of correct substance properly administered
  • poisoning by overdose of substance
  • poisoning by wrong substance given or taken in error
  • underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
Excludes1(Not coded here. Use a different code.)
  • toxic reaction to local anesthesia in pregnancy (O29.3-)
Excludes2(Not included here. Code separately if applicable.)
  • abuse and dependence of psychoactive substances (F10-F19)
  • abuse of non-dependence-producing substances (F55.-)
  • immunodeficiency due to drugs (D84.821)
  • drug reaction and poisoning affecting newborn (P00-P96)
  • pathological drug intoxication (inebriation) (F10-F19)
Code First
  • , for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
  • aspirin gastritis (K29.-)
  • blood disorders (D56-D76)
  • contact dermatitis (L23-L25)
  • dermatitis due to substances taken internally (L27.-)
  • nephropathy (N14.0-N14.2)
Use Additional Code
  • code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
  • underdosing of medication regimen (Z91.12-, Z91.13-)

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T36-T50Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
T42Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugsNot billable
T42.0Poisoning by, adverse effect of and underdosing of hydantoin derivativesSubcodes
T42.1Poisoning by, adverse effect of and underdosing of iminostilbenesSubcodes
T42.2Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinedionesSubcodes
T42.3Poisoning by, adverse effect of and underdosing of barbituratesSubcodes
T42.4Poisoning by, adverse effect of and underdosing of benzodiazepinesSubcodes
T42.5Poisoning by, adverse effect of and underdosing of mixed antiepilepticsSubcodes
T42.6Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugsSubcodes
T42.7Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugsSubcodes
T42.8Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantsSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to T42:

blockT36-T50
Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
View context instructions
chapterCH19
Injury, poisoning and certain other consequences of external causes (S00-T88)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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