6C4A.0

ICD-11 MMS 2026-01

Episode of harmful use of nicotine

Description

An episode of nicotine use that has caused damage to a person’s physical or mental health. Harm to health of the individual occurs due to one or more of the following: (1) direct or secondary toxic effects on body organs and systems; or (2) a harmful route of administration. This diagnosis should not be made if the harm is attributed to a known pattern of nicotine use.

Index terms

  • Episode of harmful use of nicotine

Excludes

  • 6C4A.1 – Harmful pattern of use of nicotine
  • 6C4A.2 – Nicotine dependence
  • NE61 – Harmful effects of or exposure to noxious substances, chiefly nonmedicinal as to source, not elsewhere classified

Exclusions from above levels

  • QE62 – Uncomplicated bereavement
  • QE84 – Acute stress reaction

Sibling codes

  • 6C4A.1 – Harmful pattern of use of nicotine
  • 6C4A.2 – Nicotine dependence
  • 6C4A.3 – Nicotine intoxication
  • 6C4A.4 – Nicotine withdrawal
  • 6C4A.Y – Other specified disorders due to use of nicotine
  • 6C4A.Z – Disorders due to use of nicotine, unspecified

Foundation entity

Episode of harmful use of nicotine – http://id.who.int/icd/entity/1356720300

Allowed postcoordination axes

Part of: 6C4A: Disorders due to use of nicotine › 06: Mental, behavioural or neurodevelopmental disorders