2020 ICD-10-CM Diagnosis Code T42.4

Poisoning by, adverse effect of and underdosing of benzodiazepines

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • T42.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • Short description: Benzodiazepines
  • The 2020 edition of ICD-10-CM T42.4 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of T42.4 - other international versions of ICD-10 T42.4 may differ.
The following code(s) above T42.4 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to T42.4:
  • S00-T88
    2020 ICD-10-CM Range S00-T88

    Injury, poisoning and certain other consequences of external causes

    Note
    • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
    Type 1 Excludes
    Use Additional
    • code to identify any retained foreign body, if applicable (Z18.-)
    Injury, poisoning and certain other consequences of external causes
  • T36-T50
    2020 ICD-10-CM Range T36-T50

    Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances

    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)
    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
    Note
    • The drug giving rise to the adverse effect should be identified by use of codes from categories T36-T50 with fifth or sixth character 5.
    Type 1 Excludes
    • toxic reaction to local anesthesia in pregnancy (O29.3-)
    Type 2 Excludes
    • abuse and dependence of psychoactive substances (F10-F19)
    • abuse of non-dependence-producing substances (F55.-)
    • drug reaction and poisoning affecting newborn (P00-P96)
    • pathological drug intoxication (inebriation) (F10-F19)
    Use Additional
    • 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-)
    Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
  • T42
    ICD-10-CM Diagnosis Code T42

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

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
    Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to T42.4:
  • Type 1 Excludes: T41
    , T43
    ICD-10-CM Diagnosis Code T41

    Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • benzodiazepines (T42.4-)
    • cocaine (T40.5-)
    • complications of anesthesia during pregnancy (O29.-)
    • complications of anesthesia during labor and delivery (O74.-)
    • complications of anesthesia during the puerperium (O89.-)
    • opioids (T40.0-T40.2-)
    ICD-10-CM Diagnosis Code T43

    Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.- -F19.-)
ICD-10-CM Codes Adjacent To T42.4
T42.3X4D …… subsequent encounter
T42.3X4S …… sequela
T42.3X5 Adverse effect of barbiturates
T42.3X5A …… initial encounter
T42.3X5D …… subsequent encounter
T42.3X5S …… sequela
T42.3X6 Underdosing of barbiturates
T42.3X6A …… initial encounter
T42.3X6D …… subsequent encounter
T42.3X6S …… sequela
T42.4 Poisoning by, adverse effect of and underdosing of benzodiazepines
T42.4X Poisoning by, adverse effect of and underdosing of benzodiazepines
T42.4X1 Poisoning by benzodiazepines, accidental (unintentional)
T42.4X1A …… initial encounter
T42.4X1D …… subsequent encounter
T42.4X1S …… sequela
T42.4X2 Poisoning by benzodiazepines, intentional self-harm
T42.4X2A …… initial encounter
T42.4X2D …… subsequent encounter
T42.4X2S …… sequela
T42.4X3 Poisoning by benzodiazepines, assault

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.