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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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

This premium article covers the coding-oriented classification of arachnoiditis and meningitis, with attention to how related index terms are organized and how cases may be linked to infectious, inflammatory, postoperative, malignant, or symptom-based categories. It is intended for coders and compliance professionals who need to understand the general scope of the guidance and the code sets involved without relying on the premium text alone.

Why This Topic Matters

These conditions can be documented in ways that overlap with infection, inflammation, postoperative complications, malignancy, or nonspecific symptoms. Understanding the article’s scope helps users find the relevant coding guidance and identify which classification systems are discussed.

What You Will Learn

  • How arachnoiditis and meningitis are framed in coding references
  • How related index terminology is organized at a high level
  • Which broad classification areas are discussed for infectious, inflammatory, postoperative, malignant, and symptom-based presentations
  • How the article distinguishes between general clinical terminology and coding-oriented classification topics

Who Should Read This

  • Medical coders
  • Coding auditors
  • Compliance professionals
  • Clinical documentation specialists
  • Revenue cycle staff

Codes Discussed

  • ICD-9-CM: 321
  • ICD-9-CM: 322.0
  • ICD-9-CM: 198.4
  • ICD-9-CM: 781.6
  • ICD-9-CM: 481
  • ICD-9-CM: 487.8

Code Ranges Discussed

  • ICD-9-CM: 001-139
  • ICD-9-CM: 320-322
  • ICD-9-CM: 722.80-722.83
  • ICD-9-CM: 737.12

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