AHA Coding Clinic® for ICD-9 - 1987 January - February

Arachnoiditis and Meningitis

The arachnoid (arachnoidea) is a delicate fibrous membrane forming the middle of three coverings of the brain and spinal cord. Leptomeninges (collective term denoting the arachnoidea and pia mater) and pachymeninges (dura mater) are the other coverings of the brain and spinal cord. Meninges refers to any one of these membranous coverings of the brain and spinal cord and explains why the main term entries in the Alphabetic Index for Arachnoiditis, Leptomeningitis, and Pachymeningitis include the cross-reference to "see also Meningitis." Meningitis has a detailed listing of subterm modifiers that are to be referenced for specificity as needed...

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