F81 | 
		 | 
		Specific developmental disorders of scholastic skills   | 
	
 |  | 
	
		 F81.0 | 
		  | 
		Specific reading disorder | 
	 
	
		 |  | 
		
| 'Backward reading' |  | Developmental dyslexia |  | Specific learning disorder, with impairment in reading |  | Specific reading retardation |  	
		| Excludes1 | 
		alexia NOS (R48.0) dyslexia NOS (R48.0)
  | 
	 
 
 | 
	   | 
 |  | 
	
		 F81.2 | 
		  | 
		Mathematics disorder | 
	 
	
		 |  | 
		
| Developmental acalculia |  | Developmental arithmetical disorder |  | Developmental Gerstmann's syndrome |  | Specific learning disorder, with impairment in mathematics |  	
		| Excludes1 | 
		acalculia NOS (R48.8)
  | 
	 
	
		| Excludes2 | 
		arithmetical difficulties associated with a reading disorder (F81.0) arithmetical difficulties associated with a spelling disorder (F81.81) arithmetical difficulties due to inadequate teaching (Z55.8)
  | 
	 
 
 | 
	   | 
 |  | 
	
		 F81.8 | 
		 | 
		Other developmental disorders of scholastic skills | 
	 
 |  | 
	
		 F81.81 | 
		  | 
		Disorder of written expression | 
	 
	
		 |  | 
		
| Specific learning disorder, with impairment in written expression |  | Specific spelling disorder |   
 | 
	   |   |  | 
	
		 F81.89 | 
		 | 
		Other developmental disorders of scholastic skills | 
	 
  |    | 
 |  | 
	
		 F81.9 | 
		  | 
		Developmental disorder of scholastic skills, unspecified | 
	 
	
		 |  | 
		
| Knowledge acquisition disability NOS |  | Learning disability NOS |  | Learning disorder NOS |  	
		| nonPrimary | 
		Yes
  | 
	 
 
 | 
	   |