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5. HEADACHE ATTRIBUTED TO HEAD AND/OR NECK TRAUMA 6. HEADACHE ATTRIBUTED TO CRANIAL OR CERVICAL VASCULAR DISORDER 7. HEADACHE ATTRIBUTED TO NON-VASCULAR INTRACRANIAL DISORDER 8. HEADACHE ATTRIBUTED TO A SUBSTANCE OR ITS WITHDRAWAL 8.1. Headache induced by acute substance use or exposure  8.2. Medication-overuse headache (MOH) 8.2.1. Ergotamine-overuse headache [Y52.5] 8.2.2. Triptan-overuse headache 8.2.3. Analgesic-overuse headache [F55.2] 8.2.4. Opioid-overuse headache [F11.2] 8.2.5. Combination analgesic-overuse headache [F55.2] 8.2.6. Medication-overuse headache attributed to combination of acute medications 8.2.7. Headache attributed to other medication overuse [code to specify substance] 8.2.8. Probable medication-overuse headache [code to specify substance] 8.3. Headache as an adverse event attributed to chronic medication [code to specify substance] 8.4. Headache attributed to substance withdrawal Bibliography9. HEADACHE ATTRIBUTED TO INFECTION 10. HEADACHE ATTRIBUTED TO DISORDER OF HOMOEOSTASIS 11. HEADACHE OR FACIAL PAIN ATTRIBUTED TO DISORDER OF CRANIUM, NECK, EYES, EARS, NOSE, SINUSES, TEETH, MOUTH OR OTHER FACIAL OR CRANIAL STRUCTURES 12. HEADACHE ATTRIBUTED TO PSYCHIATRIC DISORDER 

IHS	Diagnosis	ICD-10
8.2.8	Probable medication-overuse headache [code to specify substance]	G44.41 or G44.83

Diagnostic criteria:

Headache fulfilling criteria A, C and D for 8.2 Medication-overuse headache
Medication overuse fulfilling criterion B for any one of the subforms 8.2.1 to 8.2.7
One or other of the following:
1. overused medication has not yet been withdrawn
2. medication overuse has ceased within the last 2 months but headache has not so far resolved or reverted to its previous pattern

Comment:

Codable subforms of 8.2.8 Probable medication-overuse headache are 8.2.8.1 Probable ergotamine-overuse headach, 8.2.8.2 Probable triptan-overuse headache, 8.2.8.3 Probable analgesic-overuse headache, 8.2.8.4 Probable opioid-overuse headache, 8.2.8.5 Probable combination analgesic-overuse headache, 8.2.8.6 Headache probably attributed to overuse of acute medication combinations and 8.2.8.7 Headache probably attributed to other medication overuse.

Many patients fulfilling the criteria for 8.2.8 Probable medication-overuse headache also fulfil criteria for either 1.6.5 Probable chronic migraine or 2.4.3 Probable chronic tension-type headache. They should be coded for both until causation is established after withdrawal of the overused medication. Patients with 1.6.5 Probable chronic migraine should additionally be coded for the antecedent migraine subtype (usually 1.1 Migraine without aura).

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IHS vs. ICD-10

To facilitate headache diagnosis in daily practice, the classification provides the corresponding WHO ICD-10NA codes for each IHS code.

IHS Subcommittee

The Classification Subcommittee prepares and revises the International Classification of Headache Disorders.

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Cephalalgia

Cephalalgia is the official journal of the IHS. It contains original papers on all aspects of headache. The journal provides an international forum for original research papers, review articles and short communications.www.cephalalgia.org

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