|  K04 |  | Diseases of pulp and periapical tissues   | 
|  |  | 
	
		|  K04.0 |  | Pulpitis |  
		|  |  | 
| Acute pulpitis |  | Chronic (hyperplastic) (ulcerative) pulpitis |  |  |  |  | 
	
		|  K04.01 |  | Reversible pulpitis |  |  |  |  | 
	
		|  K04.02 |  | Irreversible pulpitis |  |  | 
|  |  | 
	
		|  K04.1 |  | Necrosis of pulp |  
		|  |  |  |  | 
|  |  | 
	
		|  K04.2 |  | Pulp degeneration |  
		|  |  | 
| Denticles |  | Pulpal calcifications |  | Pulpal stones |  |  | 
|  |  | 
	
		|  K04.3 |  | Abnormal hard tissue formation in pulp |  
		|  |  | 
| Secondary or irregular dentine |  |  | 
|  |  | 
	
		|  K04.4 |  | Acute apical periodontitis of pulpal origin |  
		|  |  | 
| Acute apical periodontitis NOS |  
		| Excludes1 | acute periodontitis (K05.2-) 
 |  |  | 
|  |  | 
	
		|  K04.5 |  | Chronic apical periodontitis |  
		|  |  | 
| Apical or periapical granuloma |  | Apical periodontitis NOS |  
		| Excludes1 | chronic periodontitis (K05.3-) 
 |  |  | 
|  |  | 
	
		|  K04.6 |  | Periapical abscess with sinus |  
		|  |  | 
| Dental abscess with sinus |  | Dentoalveolar abscess with sinus |  |  | 
|  |  | 
	
		|  K04.7 |  | Periapical abscess without sinus |  
		|  |  | 
| Dental abscess without sinus |  | Dentoalveolar abscess without sinus |  |  | 
|  |  | 
	
		|  K04.8 |  | Radicular cyst |  
		|  |  | 
| Apical (periodontal) cyst |  | Periapical cyst |  | Residual radicular cyst |  
		| Excludes2 | lateral periodontal cyst (K09.0) 
 |  |  | 
|  |  | 
	
		|  K04.9 |  | Other and unspecified diseases of pulp and periapical tissues |  |  |  | 
	
		|  K04.90 |  | Unspecified diseases of pulp and periapical tissues |  |  |  |  | 
	
		|  K04.99 |  | Other diseases of pulp and periapical tissues |  |  |