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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
10.3.2	Headache attributed to hypertensive crisis without hypertensive encephalopathy [I10]	G44.813

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. bilateral
2. pulsating quality
3. precipitated by physical activity
Hypertensive crisis defined as a paroxysmal rise in systolic (to >160 mm Hg) and/or diastolic (to >120 mm Hg) blood pressure but no clinical features of hypertensive encephalopathy
Headache develops during hypertensive crisis
Headache resolves within 1 hour after normalisation of blood pressure
Appropriate investigations have ruled out vasopressor toxins or medications as causative factors

Comment:

Paroxysmal hypertension may occur in association with failure of baroreceptor reflexes (after carotid endarterectomy or subsequent to irradiation of the neck) or in patients with enterochromaffin cell tumours.

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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.

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