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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
10.3.5	Headache attributed to eclampsia [O15]	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. aggravated by physical activity
Pregnancy or puerperium (up to 4 weeks post-partum), and eclampsia defined by all of the following:
1. hypertension (>140/90 mm Hg) documented on two blood pressure readings at least 4 hours apart
2. urinary protein excretion >0.3 g per 24 hours
3. a seizure has occurred
Headache develops during periods of high blood pressure
Headache resolves within 7 days after effective treatment of hypertension
Appropriate investigations have ruled out vasopressor toxins, medications or phaeochromocytoma as causative factors
Stroke has been excluded

Comment:

Case reports indicate that eclampsia can occur in the puerperium as well as during pregnancy.

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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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