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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
9.1.4	Headache attributed to brain abscess [G06.0]	G44.821

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. bilateral
2. constant pain
3. intensity gradually increasing to moderate or severe
4. aggravated by straining
5. accompanied by nausea
Neuroimaging and/or laboratory evidence of brain abscess
Headache develops during active infection
Headache resolves within 3 months after successful treatment of the abscess

Comments:

Direct compression and irritation of the meningeal or arterial structures and increased intracranial pressure are the mechanisms for causing headache.

The most common organisms causing brain abscess include streptococcus, staphylococcus aureus, bacteroides species and enterobacter. Predisposing factors include infections of paranasal sinuses, ears, jaws, teeth or lungs.

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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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The Classification Subcommittee prepares and revises the International Classification of Headache Disorders.

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