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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
9.1.1	Headache attributed to bacterial meningitis [G00.9]	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 and/or phonophobia
Evidence of bacterial meningitis from examination of CSF
Headache develops during the meningitis
One or other of the following:
1. headache resolves within 3 months after relief from meningitis
2. headache persists but 3 months have not yet passed since relief from meningitis

Comments:

Headache is the commonest and may be the first symptom of bacterial meningitis. Headache is a key symptom of meningeal syndrome or meningism consisting usually of headache, neck stiffness and photophobia.

A variety of microorganisms may cause primary or secondary meningitis. Direct stimulation of the sensory terminals located in the meninges by bacterial infection causes the onset of headache. Bacterial products (toxins), mediators of inflammation such as bradykinin, prostaglandins and cytokines and other agents released by inflammation not only directly cause pain but also induce pain sensitisation and neuropeptide release.

When headache persists after 3 months, code as 9.4.1 Chronic post-bacterial meningitis headache.

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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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