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ICD-10-CM 2027 diagnosis code

T42.6X1Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional)

Not billable — use a more specific codeRequires 7th character

T42.6X1 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Poisoning by oth antieplptc and sed-hypntc drugs, acc

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T42.6X1

T42.6X1 is the ICD-10-CM diagnosis code for poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional). It belongs to category T42 (poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs), block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T42.6X, choose T42.6X1 (Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional)) only when documentation doesn't support a more specific option: poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm (T42.6X2), poisoning by other antiepileptic and sedative-hypnotic drugs, assault (T42.6X3), poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined (T42.6X4), adverse effect of other antiepileptic and sedative-hypnotic drugs (T42.6X5) and underdosing of other antiepileptic and sedative-hypnotic drugs (T42.6X6).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category T42

Coding notes

Applicable toConditions and synonyms classified to this code
  • Poisoning by other antiepileptic and sedative-hypnotic drugs NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T42.6X1.

› From T42.6 Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs
Excludes1
  • poisoning by, adverse effect of and underdosing of carbamazepine (T42.1-)
› From T42 Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
Excludes2
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)

Broader instructions also apply from T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Table of Drugs & Neoplasms entries

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T42.6X1

Is T42.6X1 billable?

No. T42.6X1 is a header code. Report one of its more specific subcodes instead.