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13. CRANIAL NEURALGIAS AND CENTRAL CAUSES OF FACIAL PAIN 13.1. Trigeminal neuralgia 13.2. Glossopharyngeal neuralgia 13.3. Nervus intermedius neuralgia [G51.80] 13.4. Superior laryngeal neuralgia [G52.20] 13.5. Nasociliary neuralgia [G52.80] 13.6. Supraorbital neuralgia [G52.80] 13.7. Other terminal branch neuralgias [G52.80] 13.8. Occipital neuralgia [G52.80] 13.9. Neck-tongue syndrome 13.10. External compression headache 13.11. Cold-stimulus headache 13.12. Constant pain caused by compression, irritation or distortion of cranial nerves or upper cervical roots by structural lesions [G53.8] + [code to specify aetiology] 13.13. Optic neuritis [H46]  13.14. Ocular diabetic neuropathy [E10-E14]  13.15. Head or facial pain attributed to herpes zoster 13.16. Tolosa-Hunt syndrome 13.17. Ophthalmoplegic “migraine” 13.18. Central causes of facial pain 13.18.1. Anaesthesia dolorosa [G52.800] + [code to specify aetiology] 13.18.2. Central post-stroke pain [G46.21] 13.18.3. Facial pain attributed to multiple sclerosis [G35] 13.18.4. Persistent idiopathic facial pain [G50.1] 13.18.5. Burning mouth syndrome [code to specify aetiology] 13.19. Other cranial neuralgia or other centrally-mediated facial pain [code to specify aetiology] Bibliography and reference14. OTHER HEADACHE, CRANIAL NEURALGIA, CENTRAL OR PRIMARY FACIAL PAIN 

IHS	Diagnosis	ICD-10
13.18.4	Persistent idiopathic facial pain [G50.1]	G44.847
Previously used terms	Atypical facial pain

Description:

Persistent facial pain that does not have the characteristics of the cranial neuralgias described above and is not attributed to another disorder.

Diagnostic criteria:

Pain in the face, present daily and persisting for all or most of the day, fulfilling criteria B and C
Pain is confined at onset to a limited area on one side of the face¹, and is deep and poorly localised
Pain is not associated with sensory loss or other physical signs
Investigations including x-ray of face and jaws do not demonstrate any relevant abnormality

Note:

Pain at onset is commonly in the nasolabial fold or side of the chin, and may spread to the upper or lower jaw or a wider area of the face and neck.

Comments:

Pain may be initiated by surgery or injury to the face, teeth or gums but persists without any demonstrable local cause.

Facial pain around the ear or temple may precede the detection of an ipsilateral lung carcinoma causing referred pain by invasion of the vagus nerve.

The term atypical odontalgia has been applied to a continuous pain in the teeth or in a tooth socket after extraction in the absence of any identifiable dental cause.

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IHS vs. ICD-10

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