Chapter VI

Diseases of the nervous system
(G00-G99)

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


G00		Bacterial meningitis, not elsewhere classified
		Includes:	arachnoiditis leptomeningitis meningitis pachymeningitis			} } } }	bacterial
		Excludes:	bacterial: · meningoencephalitis ( G04.2 ) · meningomyelitis ( G04.2 )
G00.0		Haemophilus meningitis
		Meningitis due to Haemophilus influenzae
G00.1		Pneumococcal meningitis
G00.2		Streptococcal meningitis
G00.3		Staphylococcal meningitis
G00.8		Other bacterial meningitis
		Meningitis due to: · Escherichia coli · Friedländer bacillus · Klebsiella
G00.9		Bacterial meningitis, unspecified
		Meningitis: · purulent NOS · pyogenic NOS · suppurative NOS


G01*		Meningitis in bacterial diseases classified elsewhere
		Meningitis (in): · anthrax ( A22.8+ ) · gonococcal ( A54.8+ ) · leptospirosis ( A27.-+ ) · listerial ( A32.1+ ) · Lyme disease ( A69.2+ ) · meningococcal ( A39.0+ ) · neurosyphilis ( A52.1+ ) · salmonella infection ( A02.2+ ) · syphilis: · congenital ( A50.4+ ) · secondary ( A51.4+ ) · tuberculous ( A17.0+ ) · typhoid fever ( A01.0+ )
		Excludes:	meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere ( G05.0* )


G02*		Meningitis in other infectious and parasitic diseases classified elsewhere
		Excludes:	meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere ( G05.1-G05.2* )
G02.0*		Meningitis in viral diseases classified elsewhere
		Meningitis (due to): · adenoviral ( A87.1+ ) · enteroviral ( A87.0+ ) · herpesviral [herpes simplex] ( B00.3+ ) · infectious mononucleosis ( B27.-+ ) · measles ( B05.1+ ) · mumps ( B26.1+ ) · rubella ( B06.0+ ) · varicella [chickenpox] ( B01.0+ ) · zoster ( B02.1+ )
G02.1*		Meningitis in mycoses
		Meningitis (in): · candidal ( B37.5+ ) · coccidioidomycosis ( B38.4+ ) · cryptococcal ( B45.1+ )
G02.8*		Meningitis in other specified infectious and parasitic diseases classified elsewhere
		Meningitis due to: · African trypanosomiasis ( B56.-+ ) · Chagas' disease (chronic) ( B57.4+ )


G03		Meningitis due to other and unspecified causes
		Includes:	arachnoiditis leptomeningitis meningitis pachymeningitis			} } } }	due to other and unspecified causes
		Excludes:	meningoencephalitis ( G04.- ) meningomyelitis ( G04.- )
G03.0		Nonpyogenic meningitis
		Nonbacterial meningitis
G03.1		Chronic meningitis
G03.2		Benign recurrent meningitis [Mollaret]
G03.8		Meningitis due to other specified causes
G03.9		Meningitis, unspecified
		Arachnoiditis (spinal) NOS


G04		Encephalitis, myelitis and encephalomyelitis
		Includes:	acute ascending myelitis meningoencephalitis meningomyelitis
		Excludes:	benign myalgic encephalomyelitis ( G93.3 ) encephalopathy: · NOS ( G93.4 ) · alcoholic ( G31.2 ) · toxic ( G92 ) multiple sclerosis ( G35 ) myelitis: · acute transverse ( G37.3 ) · subacute necrotizing ( G37.4 )
G04.0		Acute disseminated encephalitis
		Encephalitis Encephalomyelitis				} }	postimmunization
		Use additional external cause code (Chapter XX), if desired, to identify vaccine.
G04.1		Tropical spastic paraplegia
G04.2		Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
G04.8		Other encephalitis, myelitis and encephalomyelitis
		Postinfectious encephalitis and encephalomyelitis NOS
G04.9		Encephalitis, myelitis and encephalomyelitis, unspecified
		Ventriculitis (cerebral) NOS


G05*		Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
		Includes:	meningoencephalitis and meningomyelitis in diseases classified elsewhere
G05.0*		Encephalitis, myelitis and encephalomyelitis in bacterial diseases classified elsewhere
		Encephalitis, myelitis or encephalomyelitis (in): · listerial ( A32.1+ ) · meningococcal ( A39.8+ ) · syphilis: · congenital ( A50.4+ ) · late ( A52.1+ ) · tuberculous ( A17.8+ )
G05.1*		Encephalitis, myelitis and encephalomyelitis in viral diseases classified elsewhere
		Encephalitis, myelitis or encephalomyelitis (in): · adenoviral ( A85.1+ ) · cytomegaloviral ( B25.8+ ) · enteroviral ( A85.0+ ) · herpesviral [herpes simplex] ( B00.4+ ) · influenza ( J09+ , J10.8+ , J11.8+ ) · measles ( B05.0+ ) · mumps ( B26.2+ ) · postchickenpox ( B01.1+ ) · rubella ( B06.0+ ) · zoster ( B02.0+ )
G05.2*		Encephalitis, myelitis and encephalomyelitis in other infectious and parasitic diseases classified elsewhere
		Encephalitis, myelitis or encephalomyelitis in: · African trypanosomiasis ( B56.-+ ) · Chagas' disease (chronic) ( B57.4+ ) · naegleriasis ( B60.2+ ) · toxoplasmosis ( B58.2+ ) Eosinophilic meningoencephalitis ( B83.2+ )
G05.8*		Encephalitis, myelitis and encephalomyelitis in other diseases classified elsewhere
		Encephalitis in systemic lupus erythematosus ( M32.1+ )


G06		Intracranial and intraspinal abscess and granuloma
		Use additional code (B95-B97), if desired, to identify infectious agent.
G06.0		Intracranial abscess and granuloma
		Abscess (embolic)(of): · brain [any part] · cerebellar · cerebral · otogenic Intracranial abscess or granuloma: · epidural · extradural · subdural
G06.1		Intraspinal abscess and granuloma
		Abscess (embolic) of spinal cord [any part] Intraspinal abscess or granuloma: · epidural · extradural · subdural
G06.2		Extradural and subdural abscess, unspecified


G07*		Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
		Abscess of brain: · amoebic ( A06.6+ ) · gonococcal ( A54.8+ ) · tuberculous ( A17.8+ ) Schistosomiasis granuloma of brain ( B65.-+ ) Tuberculoma of: · brain ( A17.8+ ) · meninges ( A17.1+ )


G08		Intracranial and intraspinal phlebitis and thrombophlebitis
		Septic:
		· embolism · endophlebitis · phlebitis · thrombophlebitis · thrombosis				} } } } }	of intracranial or intraspinal venous sinuses and veins
		Excludes:	intracranial phlebitis and thrombophlebitis: · complicating: · abortion or ectopic or molar pregnancy ( O00-O07 , O08.7 ) · pregnancy, childbirth and the puerperium ( O22.5 , O87.3 ) · of nonpyogenic origin ( I67.6 ) nonpyogenic intraspinal phlebitis and thrombophlebitis ( G95.1 )


G09		Sequelae of inflammatory diseases of central nervous system
		Note:	This category is to be used to indicate conditions whose primary classification is to G00-G08 (i.e. excluding those marked with an asterisk (*)) as the cause of sequelae, themselves classifiable elsewhere. The "sequelae" include conditions specified as such or as late effects, or those present one year or more after onset of the causal condition. For use of this category reference should be made to the relevant morbidity and mortality coding rules and guidelines in Volume 2.