G04 | 
		  | 
		Encephalitis, myelitis and encephalomyelitis   | 
	
	
		 |  | 
		
	
		| Includes | 
		acute ascending myelitis meningoencephalitis meningomyelitis
  | 
	 
	
		| Excludes1 | 
		encephalopathy NOS (G93.40)
  | 
	 
	
		| Excludes2 | 
		acute transverse myelitis (G37.3) alcoholic encephalopathy (G31.2) multiple sclerosis (G35-) myalgic encephalomyelitis (G93.32) subacute necrotizing myelitis (G37.4) toxic encephalitis (G92.8) toxic encephalopathy (G92.8)
  | 
	 
 
 | 
	
 |  | 
	
		 G04.0 | 
		  | 
		Acute disseminated encephalitis and encephalomyelitis (ADEM) | 
	 
	
		 |  | 
		
	
		| Excludes1 | 
		acute necrotizing hemorrhagic encephalopathy (G04.3-) other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)
  | 
	 
 
 | 
	  |  | 
	
		 G04.00 | 
		 | 
		Acute disseminated encephalitis and encephalomyelitis, unspecified | 
	 
  |   |  | 
	
		 G04.01 | 
		  | 
		Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) | 
	 
	
		 |  | 
		
	
		| Excludes1 | 
		post chickenpox encephalitis (B01.1) post measles encephalitis (B05.0) post measles myelitis (B05.1)
  | 
	 
 
 | 
	   |   |  | 
	
		 G04.02 | 
		  | 
		Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis | 
	 
	
		 |  | 
		
| Encephalitis, post immunization |  | Encephalomyelitis, post immunization |  	
		| UseAdditionalCode | 
		code to identify the vaccine (T50.A-, T50.B-, T50.Z-)
  | 
	 
 
 | 
	   |    | 
 |  | 
	
		 G04.1 | 
		 | 
		Tropical spastic paraplegia | 
	 
  | 
 |  | 
	
		 G04.2 | 
		 | 
		Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified | 
	 
  | 
 |  | 
	
		 G04.3 | 
		  | 
		Acute necrotizing hemorrhagic encephalopathy | 
	 
	
		 |  | 
		
	
		| Excludes1 | 
		acute disseminated encephalitis and encephalomyelitis (G04.0-)
  | 
	 
 
 | 
	  |  | 
	
		 G04.30 | 
		 | 
		Acute necrotizing hemorrhagic encephalopathy, unspecified | 
	 
  |   |  | 
	
		 G04.31 | 
		 | 
		Postinfectious acute necrotizing hemorrhagic encephalopathy | 
	 
  |   |  | 
	
		 G04.32 | 
		  | 
		Postimmunization acute necrotizing hemorrhagic encephalopathy | 
	 
	
		 |  | 
		
 | 
	   |   |  | 
	
		 G04.39 | 
		  | 
		Other acute necrotizing hemorrhagic encephalopathy | 
	 
	
		 |  | 
		
	
		| CodeAlso | 
		underlying etiology, if applicable
  | 
	 
 
 | 
	   |    | 
 |  | 
	
		 G04.8 | 
		  | 
		Other encephalitis, myelitis and encephalomyelitis | 
	 
	
		 |  | 
		
 | 
	  |  | 
	
		 G04.81 | 
		  | 
		Other encephalitis and encephalomyelitis | 
	 
	
		 |  | 
		
| Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) |   
 | 
	   |   |  | 
	
		 G04.82 | 
		  | 
		Acute flaccid myelitis | 
	 
	
		 |  | 
		
	
		| Excludes1 | 
		transverse myelitis (G37.3)
  | 
	 
 
 | 
	   |   |  | 
	
		 G04.89 | 
		 | 
		Other myelitis | 
	 
  |    | 
 |  | 
	
		 G04.9 | 
		 | 
		Encephalitis, myelitis and encephalomyelitis, unspecified | 
	 
 |  | 
	
		 G04.90 | 
		  | 
		Encephalitis and encephalomyelitis, unspecified | 
	 
	
		 |  | 
		
| Ventriculitis (cerebral) NOS |   
 | 
	   |   |  | 
	
		 G04.91 | 
		 | 
		Myelitis, unspecified | 
	 
  |    |