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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]9.2. 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]9.4.1. Chronic post-bacterial meningitis headache [G00.9] 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
9.4.1	Chronic post-bacterial meningitis headache [G00.9]	G44.821

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. diffuse continuous pain
2. associated with dizziness
3. associated with difficulty in concentrating and/or loss of memory
Evidence of previous intracranial bacterial infection from CSF examination or neuroimaging
Headache is a direct continuation of 9.1.1 Headache attributed to bacterial meningitis
Headache persists for >3 months after resolution of infection

Comments:

A reported 32% of survivors of bacterial meningitis suffer from persistent headache (Bohr et al, 1983). There is no evidence for persistent headache following other infections, but criteria for A9.4.2 Chronic post-non-bacterial infection headache are in the appendix. More research is needed.

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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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