International Classification of Headache Disorders

The International Classification of Headache Disorders (ICHD) is a detailed hierarchical classification of all headache-related disorders published by the International Headache Society. It is considered the official classification of headaches by the World Health Organization, and, in 1992, was incorporated into the 10th edition of their International Classification of Diseases (ICD-10). Each class of headache contains explicit diagnostic criteria—meaning that the criteria include quantities rather than vague terms like several or usually—that are based on clinical and laboratory observations.

The ICHD was first published in 1988 (now known as the ICHD-1). The second and current version, the ICHD-2, was published in 2004.

Hierarchy

Primary headaches

ICHD 1, ICD10 G43: Migraine

ICHD 2, ICD10 G44.2: Tension-type headache (TTH)

ICHD 3, ICD10 G44.0: Cluster headache and other trigeminal autonomic cephalagias

ICHD 4, ICD10 G44.80: Other primary headaches

ICHD

ICHD may refer to: