8A66.1

ICD-11 MMS 2026-01

Non-convulsive status epilepticus

Description

Non-convulsive status epilepticus is defined as 5 min or more of (i) continuous clinical and/or electrographic seizure activity or (ii) recurrent seizure activity without recovery (returning to baseline) between seizures.

Coding note from above levels

Use additional code, if desired, to identify the type of seizure.

Exclusions from above levels

  • MG45 – Syncope
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
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  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes

Child codes

  • 8A66.10 – Absence status epilepticus
  • 8A66.1Y – Other specified non-convulsive status epilepticus
  • 8A66.1Z – Non-convulsive status epilepticus, unspecified

Sibling codes

  • 8A66.0 – Convulsive status epilepticus
  • 8A66.Y – Other specified status epilepticus
  • 8A66.Z – Status epilepticus, unspecified

Foundation entity

Non-convulsive status epilepticus – http://id.who.int/icd/entity/36262213

Part of: 8A66: Status epilepticus › 08: Diseases of the nervous system