Diseases of the nervous system (G00–G99)

Browse all the diagnosis codes used for diseases of the nervous system (g00–g99). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.
  • Diseases of the nervous system (G00–G99)

    Excludes2: certain conditions originating in the perinatal period (P04-P96), certain infectious and parasitic diseases (A00-B99), complications of pregnancy, childbirth and the puerperium (O00-O9A), congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99), endocrine, nutritional and metabolic diseases (E00-E88), injury, poisoning and certain other consequences of external causes (S00-T88), neoplasms (C00-D49), symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

    • Inflammatory diseases of the central nervous system (G00-G09)

      • Bacterial meningitis, not elsewhere classified (G00)
      • Meningitis in bacterial diseases classified elsewhere (G01)
      • Meningitis in other infectious and parasitic diseases classified elsewhere (G02)
      • Meningitis due to other and unspecified causes (G03)
      • Encephalitis, myelitis and encephalomyelitis (G04)
      • Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere (G05)
      • Intracranial and intraspinal abscess and granuloma (G06)
      • Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere (G07)
      • Intracranial and intraspinal phlebitis and thrombophlebitis (G08)
      • Sequelae of inflammatory diseases of central nervous system (G09)
    • Systemic atrophies primarily affecting the central nervous system (G10-G14)

      • Huntington's disease (G10)
      • Hereditary ataxia (G11)
      • Spinal muscular atrophy and related syndromes (G12)
      • Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere (G13)
      • Postpolio syndrome (G14)
    • Extrapyramidal and movement disorders (G20-G26)

      • Parkinson's disease (G20)
      • Secondary parkinsonism (G21)
      • Other degenerative diseases of basal ganglia (G23)
      • Dystonia (G24)
      • Other extrapyramidal and movement disorders (G25)
      • Extrapyramidal and movement disorders in diseases classified elsewhere (G26)
    • Other degenerative diseases of the nervous system (G30-G32)

      • Alzheimer's disease (G30)
      • Other degenerative diseases of nervous system, not elsewhere classified (G31)
      • Other degenerative disorders of nervous system in diseases classified elsewhere (G32)
    • Demyelinating diseases of the central nervous system (G35-G37)

      • Multiple sclerosis (G35)
      • Other acute disseminated demyelination (G36)
      • Other demyelinating diseases of central nervous system (G37)
    • Episodic and paroxysmal disorders (G40-G47)

      • Epilepsy and recurrent seizures (G40)
      • Migraine (G43)
      • Other headache syndromes (G44)
      • Transient cerebral ischemic attacks and related syndromes (G45)
      • Vascular syndromes of brain in cerebrovascular diseases (G46)
      • Sleep disorders (G47)
    • Nerve, nerve root and plexus disorders (G50-G59)

      • Disorders of trigeminal nerve (G50)
      • Facial nerve disorders (G51)
      • Disorders of other cranial nerves (G52)
      • Cranial nerve disorders in diseases classified elsewhere (G53)
      • Nerve root and plexus disorders (G54)
      • Nerve root and plexus compressions in diseases classified elsewhere (G55)
      • Mononeuropathies of upper limb (G56)
      • Mononeuropathies of lower limb (G57)
      • Other mononeuropathies (G58)
      • Mononeuropathy in diseases classified elsewhere (G59)
    • Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)

      • Hereditary and idiopathic neuropathy (G60)
      • Inflammatory polyneuropathy (G61)
      • Other and unspecified polyneuropathies (G62)
      • Polyneuropathy in diseases classified elsewhere (G63)
      • Other disorders of peripheral nervous system (G64)
      • Sequelae of inflammatory and toxic polyneuropathies (G65)
    • Diseases of myoneural junction and muscle (G70-G73)

      • Myasthenia gravis and other myoneural disorders (G70)
      • Primary disorders of muscles (G71)
      • Other and unspecified myopathies (G72)
      • Disorders of myoneural junction and muscle in diseases classified elsewhere (G73)
    • Cerebral palsy and other paralytic syndromes (G80-G83)

      • Cerebral palsy (G80)
      • Hemiplegia and hemiparesis (G81)
      • Paraplegia (paraparesis) and quadriplegia (quadriparesis) (G82)
      • Other paralytic syndromes (G83)
    • Other disorders of the nervous system (G89-G99)

      • Pain, not elsewhere classified (G89)
      • Disorders of autonomic nervous system (G90)
      • Hydrocephalus (G91)
      • Toxic encephalopathy (G92)
      • Other disorders of brain (G93)
      • Other disorders of brain in diseases classified elsewhere (G94)
      • Other and unspecified diseases of spinal cord (G95)
      • Other disorders of central nervous system (G96)
      • Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified (G97)
      • Other disorders of nervous system not elsewhere classified (G98)
      • Other disorders of nervous system in diseases classified elsewhere (G99)