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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 9. HEADACHE ATTRIBUTED TO INFECTION 10. HEADACHE ATTRIBUTED TO DISORDER OF HOMOEOSTASIS 10.1. Headache attributed to hypoxia and/or hypercapnia 10.2. Dialysis headache [Y84.1] 10.3. Headache attributed to arterial hypertension [I10] 10.3.1. Headache attributed to phaeochromocytoma [D53.0 (benign) or C74.1 (malignant)] 10.3.2. Headache attributed to hypertensive crisis without hypertensive encephalopathy [I10] 10.3.3. Headache attributed to hypertensive encephalopathy [I67.4] 10.3.4. Headache attributed to pre-eclampsia [O13-O14] 10.3.5. Headache attributed to eclampsia [O15] 10.3.6. Headache attributed to acute pressor response to an exogenous agent [code to specify aetiology] 10.4. Headache attributed to hypothyroidism [E03.9] 10.5. Headache attributed to fasting [T73.0] 10.6. Cardiac cephalalgia [code to specify aetiology] 10.7. Headache attributed to other disorder of homoeostasis [code to specify aetiology] Bibliography11. 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
10.3.6	Headache attributed to acute pressor response to an exogenous agent [code to specify aetiology]	G44.813
Coded elsewhere	8.1.6 Cocaine-induced headache .

Diagnostic criteria:

Headache, no typical characteristics known, fulfilling criteria C and D
An appropriate agent or toxin has been administered or ingested and an acute rise in blood pressure has occurred
Headache develops in close temporal relation to the acute rise in blood pressure
Headache resolves within 24 hours after normalisation of blood pressure
No other mechanism for the headache is apparent

Comments:

Apart from cocaine, agents that can produce acute elevations of blood pressure include sympathomimetics and amphetamines, and monoamine oxidase inhibitors when interactions with tyramine-containing foods occur.

There is insufficient evidence to set criteria for how large an elevation in blood pressure is required to produce headache, and this may vary from person to person. Criterion D is arbitrary, but included to increase the specificity of the diagnostic criteria.

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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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