6C4A.1

ICD-11 MMS 2026-01

Harmful pattern of use of nicotine

Description

A pattern of nicotine use that has caused damage to a person’s physical or mental health. The pattern of nicotine use is evident over a period of at least 12 months if substance use is episodic or at least one month if use is continuous (i.e., daily or almost daily). 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.

Excludes

  • 6C4A.0 – Episode of harmful use of nicotine
  • 6C4A.2 – Nicotine dependence

Exclusions from above levels

  • QE62 – Uncomplicated bereavement
  • QE84 – Acute stress reaction

Child codes

  • 6C4A.10 – Harmful pattern of use of nicotine, episodic
  • 6C4A.11 – Harmful pattern of use of nicotine, continuous
  • 6C4A.1Z – Harmful pattern of use of nicotine, unspecified

Sibling codes

  • 6C4A.0 – Episode of harmful 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

Harmful pattern of use of nicotine – http://id.who.int/icd/entity/299901355

Allowed postcoordination axes

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