List of ICD-9 codes 320–359: diseases of the nervous system

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  • The International Classification of Diseases, Ninth Revision (ICD-9) is an older version of the system used to classify and code diseases, symptoms, and medical procedures. It has since been replaced by the ICD-10 and ICD-11. However, here is a list of ICD-9 codes 320-359, which pertain to diseases of the nervous system:
  • 320: Bacterial meningitis
  • 321: Meningitis due to other organisms
  • 322: Meningitis of unspecified cause
  • 323: Encephalitis, myelitis, and encephalomyelitis
  • 324: Intracranial and intraspinal abscess
  • 325: Phlebitis and thrombophlebitis of intracranial venous sinuses
  • 326: Late effects of intracranial abscess or pyogenic infection
  • 327: Organic sleep disorders
  • 330: Cerebral degenerations usually manifest in childhood
  • 331: Other cerebral degenerations
  • 332: Parkinson's disease
  • 333: Other extrapyramidal diseases and abnormal movement disorders
  • 334: Spinocerebellar disease
  • 335: Anterior horn cell disease
  • 336: Other diseases of spinal cord
  • 337: Disorders of the autonomic nervous system
  • 338: Pain, not elsewhere classified
  • 340: Multiple sclerosis
  • 341: Other demyelinating diseases of the central nervous system
  • 342: Hemiplegia
  • 343: Infantile cerebral palsy
  • 344: Other paralytic syndromes
  • 345: Epilepsy and recurrent seizures
  • 346: Migraine
  • 347: Cataplexy and narcolepsy
  • 348: Other conditions of the brain
  • 349: Other and unspecified disorders of the nervous system
  • 350: Trigeminal neuralgia
  • 351: Facial nerve disorders
  • 352: Disorders of other cranial nerves
  • 353: Nerve root and plexus disorders
  • 354: Mononeuritis of the upper limb and mononeuritis multiplex
  • 355: Mononeuritis of the lower limb
  • 356: Hereditary and idiopathic peripheral neuropathy
  • 357: Inflammatory and toxic neuropathy
  • 358: Myoneural disorders
  • 359: Muscular dystrophies and other myopathies
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Contributors: Prab R. Tumpati, MD