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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]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
9.3	Headache attributed to HIV/AIDS [B22]	G44.821
Coded elsewhere	Headache attributed to a specific supervening infection is coded according to that infection.

Diagnostic criteria:

Headache with variable mode of onset, site and intensity¹ fulfilling criteria C and D
Confirmation of HIV infection and/or of the diagnosis of AIDS, and of the presence of HIV/AIDS-related pathophysiology likely to cause headache², by neuroimaging, CSF examination, EEG and laboratory investigations
Headache develops in close temporal relation to the HIV/AIDS-related pathophysiology
Headache resolves within 3 months after the infection subsides

Notes:

Headache as a symptom of HIV infection is dull and bilateral. Otherwise. the onset, site and intensity of headache vary according to the HIV/AIDS-related conditions (such as meningitis, encephalitis or systemic infection) that are present.
See Comments.

Comments:

Dull bilateral headache may be a part of the symptomatology of HIV infection. Headache may also be attributed to aseptic meningitis during HIV infection (but not exclusively in the AIDS stages) and to secondary meningitis or encephalitis associated with opportunistic infections or neoplasms (which mostly occur in the AIDS stages). The most common intracranial infections in HIV/AIDS are toxoplasmosis and cryptococcal meningitis.

Headache occurring in patients with HIV/AIDS but attributed to a specific supervening infection is coded to that infection.

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