G00–G99: Diseases of the Nervous System
Chapter 6 of ICD-10-CM 2027, 932 codes in 11 blocks.
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Chapter instructions
Excludes2: not included here, code separately if applicable
- 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
All codesBillable only700 results
- G45.3Amaurosis fugax
- G45.4Transient global amnesia
- G45.8Other transient cerebral ischemic attacks and related syndromes
- G45.9Transient cerebral ischemic attack, unspecified
- G46.0Middle cerebral artery syndrome
- G46.1Anterior cerebral artery syndrome
- G46.2Posterior cerebral artery syndrome
- G46.3Brain stem stroke syndrome
- G46.4Cerebellar stroke syndrome
- G46.5Pure motor lacunar syndrome
- G46.6Pure sensory lacunar syndrome
- G46.7Other lacunar syndromes
- G46.8Other vascular syndromes of brain in cerebrovascular diseases
- G47.00Insomnia, unspecified
- G47.01Insomnia due to medical condition
- G47.09Other insomnia
- G47.10Hypersomnia, unspecified
- G47.11Idiopathic hypersomnia with long sleep time
- G47.12Idiopathic hypersomnia without long sleep time
- G47.13Recurrent hypersomnia
- G47.14Hypersomnia due to medical condition
- G47.19Other hypersomnia
- G47.20Circadian rhythm sleep disorder, unspecified type
- G47.21Circadian rhythm sleep disorder, delayed sleep phase type
- G47.22Circadian rhythm sleep disorder, advanced sleep phase type
- G47.23Circadian rhythm sleep disorder, irregular sleep wake type
- G47.24Circadian rhythm sleep disorder, free running type
- G47.25Circadian rhythm sleep disorder, jet lag type
- G47.26Circadian rhythm sleep disorder, shift work type
- G47.27Circadian rhythm sleep disorder in conditions classified elsewhere
- G47.29Other circadian rhythm sleep disorder
- G47.30Sleep apnea, unspecified
- G47.31Primary central sleep apnea
- G47.32High altitude periodic breathing
- G47.33Obstructive sleep apnea (adult) (pediatric)
- G47.34Idiopathic sleep related nonobstructive alveolar hypoventilation
- G47.35Congenital central alveolar hypoventilation syndrome
- G47.36Sleep related hypoventilation in conditions classified elsewhere
- G47.37Central sleep apnea in conditions classified elsewhere
- G47.39Other sleep apnea
- G47.411Narcolepsy with cataplexy
- G47.419Narcolepsy without cataplexy
- G47.421Narcolepsy in conditions classified elsewhere with cataplexy
- G47.429Narcolepsy in conditions classified elsewhere without cataplexy
- G47.50Parasomnia, unspecified
- G47.51Confusional arousals
- G47.52REM sleep behavior disorder
- G47.53Recurrent isolated sleep paralysis
- G47.54Parasomnia in conditions classified elsewhere
- G47.59Other parasomnia