Chapter 6
Diseases of the nervous system
G00–G99
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FY 2027 effective October 1, 2026 · 68 categories in this chapter
Blocks in This Chapter
ICD-10-CM groups this chapter's categories into 11 blocks of three-character categories.
- G00 –G09 Inflammatory diseases of the central nervous system
- G10 –G14 Systemic atrophies primarily affecting the central nervous system
- G20 –G26 Extrapyramidal and movement disorders
- G30 –G32 Other degenerative diseases of the nervous system
- G35 –G37 Demyelinating diseases of the central nervous system
- G40 –G47 Episodic and paroxysmal disorders
- G50 –G59 Nerve, nerve root and plexus disorders
- G60 –G65 Polyneuropathies and other disorders of the peripheral nervous system
- G70 –G73 Diseases of myoneural junction and muscle
- G80 –G83 Cerebral palsy and other paralytic syndromes
- G89 –G99 Other disorders of the nervous system
Categories
Inflammatory diseases of the central nervous system (G00-G09)
- G00 Bacterial meningitis, not elsewhere classified Has subcategories
- G01 Meningitis in bacterial diseases classified elsewhere
- G02 Meningitis in other infectious and parasitic diseases classified elsewhere
- G03 Meningitis due to other and unspecified causes Has subcategories
- G04 Encephalitis, myelitis and encephalomyelitis Has subcategories
- G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere Has subcategories
- G06 Intracranial and intraspinal abscess and granuloma Has subcategories
- G07 Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
- G08 Intracranial and intraspinal phlebitis and thrombophlebitis
- G09 Sequelae of inflammatory diseases of central nervous system
Systemic atrophies primarily affecting the central nervous system (G10-G14)
Extrapyramidal and movement disorders (G20-G26)
- G20 Parkinson's disease Has subcategories
- G21 Secondary parkinsonism Has subcategories
- G23 Other degenerative diseases of basal ganglia Has subcategories
- G24 Dystonia Has subcategories
- G25 Other extrapyramidal and movement disorders Has subcategories
- G26 Extrapyramidal and movement disorders in diseases classified elsewhere
Other degenerative diseases of the nervous system (G30-G32)
Demyelinating diseases of the central nervous system (G35-G37)
Episodic and paroxysmal disorders (G40-G47)
- G40 Epilepsy and recurrent seizures Has subcategories
- G43 Migraine Has subcategories
- G44 Other headache syndromes Has subcategories
- G45 Transient cerebral ischemic attacks and related syndromes Has subcategories
- G46 Vascular syndromes of brain in cerebrovascular diseases Has subcategories
- G47 Sleep disorders Has subcategories
Nerve, nerve root and plexus disorders (G50-G59)
- G50 Disorders of trigeminal nerve Has subcategories
- G51 Facial nerve disorders Has subcategories
- G52 Disorders of other cranial nerves Has subcategories
- G53 Cranial nerve disorders in diseases classified elsewhere
- G54 Nerve root and plexus disorders Has subcategories
- G55 Nerve root and plexus compressions in diseases classified elsewhere
- G56 Mononeuropathies of upper limb Has subcategories
- G57 Mononeuropathies of lower limb Has subcategories
- G58 Other mononeuropathies Has subcategories
- G59 Mononeuropathy in diseases classified elsewhere
Polyneuropathies and other disorders of the peripheral nervous system (G60-G65)
- G60 Hereditary and idiopathic neuropathy Has subcategories
- G61 Inflammatory polyneuropathy Has subcategories
- G62 Other and unspecified polyneuropathies Has subcategories
- G63 Polyneuropathy in diseases classified elsewhere
- G64 Other disorders of peripheral nervous system
- G65 Sequelae of inflammatory and toxic polyneuropathies Has subcategories
Diseases of myoneural junction and muscle (G70-G73)
Cerebral palsy and other paralytic syndromes (G80-G83)
Other disorders of the nervous system (G89-G99)
- G89 Pain, not elsewhere classified Has subcategories
- G90 Disorders of autonomic nervous system Has subcategories
- G91 Hydrocephalus Has subcategories
- G92 Toxic encephalopathy Has subcategories
- G93 Other disorders of brain Has subcategories
- G94 Other disorders of brain in diseases classified elsewhere
- G95 Other and unspecified diseases of spinal cord Has subcategories
- G96 Other disorders of central nervous system Has subcategories
- G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified Has subcategories
- G98 Other disorders of nervous system not elsewhere classified Has subcategories
- G99 Other disorders of nervous system in diseases classified elsewhere Has subcategories