G00-G99

Diseases of the nervous system

Chapter 6

Includes diseases of the central and peripheral nervous system such as meningitis, Alzheimer's, Parkinson's, and epilepsy.

Additional Information

From parent codes: G00-G99 (Chapter 6)

Excludes 2 — Not Included HereFrom G00-G99

Excludes2 means 'NOT INCLUDED HERE!' An Excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time.

  • 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)

Codes in this Chapter (68)

G00Bacterial meningitis, not elsewhere classified6 codesG01Meningitis in bacterial diseases classified elsewhereG02Meningitis in other infectious and parasitic diseases classified elsewhereG03Meningitis due to other and unspecified causes5 codesG04Encephalitis, myelitis and encephalomyelitis6 codesG05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere2 codesG06Intracranial and intraspinal abscess and granuloma3 codesG07Intracranial and intraspinal abscess and granuloma in diseases classified elsewhereG08Intracranial and intraspinal phlebitis and thrombophlebitisG09Sequelae of inflammatory diseases of central nervous systemG10Huntington's diseaseG11Hereditary ataxia9 codesG12Spinal muscular atrophy and related syndromes5 codesG13Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere4 codesG14Postpolio syndromeG20Parkinson's disease3 codesG21Secondary parkinsonism7 codesG23Other degenerative diseases of basal ganglia6 codesG24Dystonia8 codesG25Other extrapyramidal and movement disorders10 codesG26Extrapyramidal and movement disorders in diseases classified elsewhereG30Alzheimer's disease4 codesG31Other degenerative diseases of nervous system, not elsewhere classified5 codesG32Other degenerative disorders of nervous system in diseases classified elsewhere2 codesG35Multiple sclerosisG36Other acute disseminated demyelination4 codesG37Other demyelinating diseases of central nervous system8 codesG40Epilepsy and recurrent seizures11 codesG43Migraine13 codesG44Other headache syndromes7 codesG45Transient cerebral ischemic attacks and related syndromes7 codesG46Vascular syndromes of brain in cerebrovascular diseases9 codesG47Sleep disorders9 codesG50Disorders of trigeminal nerve4 codesG51Facial nerve disorders7 codesG52Disorders of other cranial nerves7 codesG53Cranial nerve disorders in diseases classified elsewhereG54Nerve root and plexus disorders10 codesG55Nerve root and plexus compressions in diseases classified elsewhereG56Mononeuropathies of upper limb7 codesG57Mononeuropathies of lower limb10 codesG58Other mononeuropathies4 codesG59Mononeuropathy in diseases classified elsewhereG60Hereditary and idiopathic neuropathy6 codesG61Inflammatory polyneuropathy4 codesG62Other and unspecified polyneuropathies5 codesG63Polyneuropathy in diseases classified elsewhereG64Other disorders of peripheral nervous systemG65Sequelae of inflammatory and toxic polyneuropathies3 codesG70Myasthenia gravis and other myoneural disorders5 codesG71Primary disorders of muscles6 codesG72Other and unspecified myopathies7 codesG73Disorders of myoneural junction and muscle in diseases classified elsewhere3 codesG80Cerebral palsy7 codesG81Hemiplegia and hemiparesis3 codesG82Paraplegia (paraparesis) and quadriplegia (quadriparesis)2 codesG83Other paralytic syndromes8 codesG89Pain, not elsewhere classified5 codesG90Disorders of autonomic nervous system10 codesG91Hydrocephalus7 codesG92Toxic encephalopathy3 codesG93Other disorders of brain10 codesG94Other disorders of brain in diseases classified elsewhereG95Other and unspecified diseases of spinal cord5 codesG96Other disorders of central nervous system4 codesG97Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified8 codesG98Other disorders of nervous system not elsewhere classified2 codesG99Other disorders of nervous system in diseases classified elsewhere3 codes