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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
9.1.2	Headache attributed to lymphocytic meningitis [G03.9]	G44.821

Diagnostic criteria:

Headache with at least one of the following characteristics and fulfilling criteria C and D:
1. acute onset
2. severe intensity
3. associated with nuchal rigidity, fever, nausea, photophobia and/or phonophobia
Examination of CSF shows lymphocytic pleocytosis, mildly elevated protein and normal glucose¹
Headache develops in close temporal association to meningitis
Headache resolves within 3 months² after successful treatment or spontaneous remission of infection

Notes:

Virus, borrelia, listeria, fungus, tuberculosis or other infective agent(s) may be identified by appropriate methods.
Headache usually resolves within 1 week.

Comments:

Headache, fever, photophobia and nuchal rigidity are the main symptoms of lymphocytic or non-bacterial meningitis and headache may remain as the main symptom throughout the course of the disease.

Headache can appear with intracranial infection but also in systemic inflammation. Since the signs of systemic inflammation associated with headache do not necessarily mean meningitis or encephalitis, diagnosis of lymphocytic meningitis must be confirmed by CSF examination.

Enteroviruses account for most viral causes. Herpes simplex, adenovirus, mumps and others may also be responsible.

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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

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