6C4C.1

ICD-11 MMS 2026-01

Harmful pattern of use of MDMA or related drugs, including MDA

Description

A pattern of use of MDMA or related drugs, including MDA, that has caused damage to a person’s physical or mental health or has resulted in behaviour leading to harm to the health of others. The pattern of use of MDMA or related drugs is evident over a period of at least 12 months if 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) behaviour related to intoxication; (2) direct or secondary toxic effects on body organs and systems; or (3) a harmful route of administration. Harm to health of others includes any form of physical harm, including trauma, or mental disorder that is directly attributable to behaviour related to MDMA or related drug intoxication on the part of the person to whom the diagnosis of Harmful pattern of use of MDMA or related drugs, including MDA applies.

Excludes

  • 6C4C.0 – Episode of harmful use of MDMA or related drugs, including MDA
  • 6C4C.2 – MDMA or related drug dependence, including MDA

Exclusions from above levels

  • QE11.6 – Hazardous use of MDMA or related drugs
  • QE62 – Uncomplicated bereavement
  • QE84 – Acute stress reaction

Child codes

  • 6C4C.10 – Harmful use of MDMA or related drugs, including MDA, episodic
  • 6C4C.11 – Harmful use of MDMA or related drugs, including MDA, continuous
  • 6C4C.1Z – Harmful pattern of use of MDMA or related drugs, including MDA, unspecified

Sibling codes

  • 6C4C.0 – Episode of harmful use of MDMA or related drugs, including MDA
  • 6C4C.2 – MDMA or related drug dependence, including MDA
  • 6C4C.3 – MDMA or related drug intoxication, including MDA
  • 6C4C.4 – MDMA or related drug withdrawal, including MDA
  • 6C4C.5 – MDMA or related drug-induced delirium, including MDA
  • 6C4C.6 – MDMA or related drug-induced psychotic disorder, including MDA
  • 6C4C.7 – Certain specified MDMA or related drug-induced mental or behavioural disorders, including MDA
  • 6C4C.Y – Other specified disorders due to use of methylene-dioxymethamphetamine [MDMA] or related drugs, including methylene-dioxyamphetamine [MDA]
  • 6C4C.Z – Disorders due to use of methylene-dioxymethamphetamine [MDMA] or related drugs, including methylene-dioxyamphetamine [MDA], unspecified

Foundation entity

Harmful pattern of use of MDMA or related drugs, including MDA – http://id.who.int/icd/entity/1662953838

Allowed postcoordination axes

Part of: 6C4C: Disorders due to use of methylene-dioxymethamphetamine [MDMA] or related drugs, including methylene-dioxyamphetamine [MDA] › 06: Mental, behavioural or neurodevelopmental disorders