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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 9.1. Headache attributed to intracranial infection [G00-G09]9.1.1. Headache attributed to bacterial meningitis [G00.9] 9.1.2. Headache attributed to lymphocytic meningitis [G03.9] 9.1.3. Headache attributed to encephalitis [G04.9] 9.1.4. Headache attributed to brain abscess [G06.0] 9.1.5. Headache attributed to subdural empyema [G06.2] 9.2. Headache attributed to systemic infection [A00-B97] 9.3. Headache attributed to HIV/AIDS [B22] 9.4. Chronic post-infection headache [code to specify aetiology]Bibliography and reference10. 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
9.1.3	Headache attributed to encephalitis [G04.9]	G44.821

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. diffuse pain
2. intensity increasing to severe
3. associated with nausea, photophobia or phonophobia
Neurological symptoms and signs of acute encephalitis, and diagnosis confirmed by EEG, CSF examination, neuroimaging and/or other laboratory investigations¹
Headache develops during encephalitis
Headache resolves within 3 months after successful treatment or spontaneous remission of the infection

Notes:

PCR method gives the specific diagnosis.

Comments:

The causes of headache include both meningeal irritation and increased intracranial pressure. Head pain may also be a systemic reaction to the toxic products of the infecting agent(s). Headache may occur early and be the only clinical symptom of encephalitis.

Herpes simplex virus, arbovirus and mumps are known causes of encephalitis. Except for HSV encephalitis (in which 95% of cases are identifiable with PCR), the causative virus is identified in fewer than half of cases of encephalitis.

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IHS vs. ICD-10

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