Specific code 2014 ICD-9-CM Diagnosis Code 322.9
Meningitis, unspecified
  • Billable Code
  • Short description: Meningitis NOS.
  • ICD-9-CM 322.9 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 322.9 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Arachnoiditis
  • Arachnoiditis, spinal
  • Benign multirecurrent endothelioleukocytal meningitis (disorder)
  • Meningitis
  • Meningitis, recurrent, benign
  • Pachymeningitis
  • Spinal arachnoiditis (disorder)
  • Ventriculitis
  • Ventriculitis of the brain (disorder)
Clinical Information
  • A disorder characterized by acute inflammation of the meninges of the brain and/or spinal cord.
  • Brain infection
  • Inflammation of the coverings of the brain and/or spinal cord, which consist of the pia mater; arachnoid; and dura mater. Infections (viral, bacterial, and fungal) are the most common causes of this condition, but subarachnoid hemorrhage (hemorrhages, subarachnoid), chemical irritation (chemical meningitis), granulomatous conditions, neoplastic conditions (carcinomatous meningitis), and other inflammatory conditions may produce this syndrome. (from Joynt, Clinical Neurology, 1994, ch24, p6)
  • Inflammation of the meninges (three thin layers of tissue that cover and protect the brain and spinal cord). Meningitis is usually caused by a bacterial or viral infection, but sometimes is caused by cancer, drug allergies, or inflammatory diseases.
  • Inflammation of the meninges.
  • Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis, which you get when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare, but can be deadly. It usually starts with bacteria that cause a cold-like infection. It can block blood vessels in the brain and lead to stroke and brain damage. It can also harm other organs. pneumococcal infections and meningococcal infections can cause bacterial meningitis.anyone can get meningitis, but it is more common in people whose bodies have trouble fighting infections. Meningitis can progress rapidly. You should seek medical care quickly if you have
    • a sudden fever
    • a severe headache
    • a stiff neck
    early treatment can help prevent serious problems, including death. Vaccines can prevent some of the bacterial infections that cause meningitis. Parents of adolescents and students living in college dorms should talk to a doctor about the vaccination.
Convert to ICD-10-CM: 322.9 converts directly to:
  • 2014 ICD-10-CM G03.9 Meningitis, unspecified
ICD-9-CM Volume 2 Index entries containing back-references to 322.9:
  • Arachnoiditis (acute) (adhesive) (basic) (brain) (cerebrospinal) (chiasmal) (chronic) (spinal) (see also Meningitis) 322.9
    • meningococcal (chronic) 036.0
    • tuberculous (see also Tuberculosis, meninges) 013.0
  • Effusion
    • cerebrospinal (see also Meningitis) 322.9
    • meninges (see also Meningitis) 322.9
    • spinal (see also Meningitis) 322.9
  • Ependymitis (acute) (cerebral) (chronic) (granular) (see also Meningitis) 322.9
  • Infection, infected, infective (opportunistic) 136.9
    • brain (see also Encephalitis) 323.9
      • late effect - see category 326
      • membranes - (see also Meningitis) 322.9
      • septic 324.0
        • late effect - see category 326
        • meninges (see also Meningitis) 320.9
    • cerebrospinal (see also Meningitis) 322.9
      • late effect - see category 326
  • Inflammation, inflamed, inflammatory (with exudation)
    • cerebrospinal (see also Meningitis) 322.9
      • late effect - see category 326
      • meningococcal 036.0
      • tuberculous (see also Tuberculosis) 013.6
  • Leptomeningitis (chronic) (circumscribed) (hemorrhagic) (nonsuppurative) (see also Meningitis) 322.9
    • late effect - see category 326
    • tuberculous (see also Tuberculosis, meninges) 013.0
  • Leptomeningopathy (see also Meningitis) 322.9
  • Meningitis (basal) (basic) (basilar) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetica) (toxic) 322.9
    • abacterial NEC (see also Meningitis, aseptic) 047.9
    • anaerobes (cocci) (gram-negative) (gram-positive) (mixed) (NEC) 320.81
    • Bacteroides (fragilis) (oralis) (melaninogenicus) 320.81
    • cancerous (M8000/6) 198.4
    • carcinomatous (M8010/6) 198.4
    • caseous (see also Tuberculosis, meninges) 013.0
    • cerebrospinal (acute) (chronic) (diplococcal) (endemic) (epidemic) (fulminant) (infectious) (malignant) (meningococcal) (sporadic) 036.0
    • clear cerebrospinal fluid NEC 322.0
    • Clostridium (haemolyticum) (novyi) NEC 320.81
    • Diplococcus pneumoniae 320.1
    • endothelial-leukocytic, benign, recurrent 047.9
    • Escherichia coli (E. coli) 320.82
    • Friedl√§nder (bacillus) 320.82
    • gram-positive cocci NEC 320.9
    • late effect - see Late, effect, meningitis
    • lymphocytic (acute) (benign) (serous) 049.0
      • choriomeningitis virus 049.0
    • meningococcal (chronic) 036.0
    • nonbacterial NEC (see also Meningitis, aseptic) 047.9
    • Pseudomonas (aeruginosa) (pyocyaneus) 320.82
    • serosa circumscripta NEC 322.0
    • serous NEC (see also Meningitis, aseptic) 047.9
    • sporadic cerebrospinal 036.0
    • streptococcal (acute) 320.2
    • traumatic (complication of injury) 958.8
    • Treponema (denticola) (macrodenticum) 320.81
    • tuberculous (see also Tuberculosis, meninges) 013.0
    • viral, virus NEC (see also Meningitis, aseptic) 047.9
    • Wallgren's (see also Meningitis, aseptic) 047.9
  • Pachymeningitis (adhesive) (basal) (brain) (cerebral) (cervical) (chronic) (circumscribed) (external) (fibrous) (hemorrhagic) (hypertrophic) (internal) (purulent) (spinal) (suppurative) (see also Meningitis) 322.9
  • Ventriculitis, cerebral (see also Meningitis) 322.9
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 322.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.