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

• 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 It has since been replaced by the ICD-10 and ICD-11.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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