8A8Z

ICD-11 MMS 2026-01

Headache disorders, unspecified

Exclusions from above levels

  • MB4D – Headache, not elsewhere classified
  • 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

Sibling codes

  • 8A80 – Migraine
  • 8A81 – Tension-type headache
  • 8A82 – Trigeminal autonomic cephalalgias
  • 8A83 – Other primary headache disorder
  • 8A84 – Secondary headache
  • 8A85 – Painful cranial neuropathies or other facial pains
  • 8A8Y – Other specified headache disorders

Foundation entity

Headache disorders – http://id.who.int/icd/entity/28995849

Part of: 08: Diseases of the nervous system