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13. CRANIAL NEURALGIAS AND CENTRAL CAUSES OF FACIAL PAIN 14. OTHER HEADACHE, CRANIAL NEURALGIA, CENTRAL OR PRIMARY FACIAL PAIN 14.1. Headache not elsewhere classified 14.2. Headache unspecified 

IHS	Diagnosis	ICD-10
14.2	Headache unspecified	R51
Previously used terms	Headache not classifiable

Diagnostic criteria:

Headache is or has been present
Not enough information is available to classify the headache at any level of this classification

Comment:

It is also apparent that a diagnosis must be made in a large number of patients where very little information is available, allowing only to state that they have headache but not which type of headache. Such patients are coded as 14.2 Headache unspecified. This code, however, must never be used as an excuse for not gathering detailed information about a headache when such information is available. It should be used only in situations where information cannot be obtained because the patient is dead, unable to communicate or unavailable.

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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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