The Los Angeles classification of oesophagitis
| Grade A | One (or more) mucosal break no longer than 5 mm, that does not extend between the tops of two mucosal folds |
| Grade B | One (or more) mucosal break more than 5 mm long that does not extend between the tops of two mucosal folds |
| Grade C | One (or more) mucosal break that is continuous between the tops of two or more mucosal folds but which involves less than 75% of the circumference |
| Grade D | One (or more) mucosal break which involves at least 75% of the oesophageal circumference |