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5. HEADACHE ATTRIBUTED TO HEAD AND/OR NECK TRAUMA 6. HEADACHE ATTRIBUTED TO CRANIAL OR CERVICAL VASCULAR DISORDER 6.1. Headache attributed to ischaemic stroke or transient ischaemic attack6.2. Headache attributed to non-traumatic intracranial haemorrhage [I62] 6.3. Headache attributed to unruptured vascular malformation [Q28] 6.4. Headache attributed to arteritis [M31]6.5. Carotid or vertebral artery pain [I63.0, I63.2, I65.0, I65.2 or I67.0]6.6. Headache attributed to cerebral venous thrombosis (CVT) [I63.6] 6.7. Headache attributed to other intracranial vascular disorder6.7.1. Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) [I67.8] 6.7.2. Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-like episodes (MELAS) [G31.81] 6.7.3. Headache attributed to benign (or reversible) angiopathy of the central nervous system [I99] 6.7.4. Headache attributed to pituitary apoplexy [E23.6] Bibliography7. 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 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
6.7.4	Headache attributed to pituitary apoplexy [E23.6]	G44.81

Diagnostic criteria:

Severe acute retro-orbital, frontal or diffuse headache accompanied by at least one of the following and fulfilling criteria C and D:
1. nausea and vomiting
2. fever
3. diminished level of consciousness
4. hypopituitarism
5. hypotension
6. ophthalmoplegia or impaired visual acuity
Neuroimaging evidence of acute haemorrhagic pituitary infarction
Headache develops simultaneously with acute haemorrhagic pituitary infarction
Headache and other symptoms and/or signs resolve within 1 month

Comment:

This rare clinical syndrome is an acute, life-threatening condition, characterised by spontaneous haemorrhagic infarction of the pituitary gland. It is one of the causes of thunderclap headache.

Magnetic resonance imaging is more sensitive than CT scan for detecting intrasellar pathology.

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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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