In the rare instance that the claimant files CDB following the termination of student
                  benefits, do not use this chart, but refer to the instructions in footnote #1.1
               
                  
                     
                        
                        
                        
                     
                     
                        
                        
                           
                           | Application Filed | Disability Began | Established Onset Date (EOD) | 
                     
                     
                        
                        
                           
                           | Before attainment of age 18 | Before attainment of age 18 | Unless the exact date is known, use the last day of the month before the month of
                                 attainment of age 18.
                               | 
                        
                           
                           | Between attainment of age 18 and 22 years 6 months | Before attainment of age 18 | Unless the exact date is known, use either: 2 
                                 
                                    
                                       • 
                                          Last day of the month before the month of attainment of age 18. or
                                    
                                       • 
                                          First day of the sixth month before the month the claimant filed the application.
                                           | 
                        
                           
                           | Between attainment of age 18 and 22 years 6 months | Between attainment of age 18 and attainment of age 22, but more than six months before the month the claimant filed the application
                               | Unless the exact date is known, use the first day of the sixth month before the month
                                 the claimant filed the application.
                               | 
                        
                           
                           | Between attainment of age 18 and 22 years 6 months | Between attainment of age 18 and attainment of age 22, but within six months before the month the claimant filed the application
                               | Use the exact date evidence establishes disability. 3 | 
                        
                           
                           | On or after attainment of age 22 years six months. | Before attainment of age 22 | Unless the exact date is known, use either: 2 
                                 
                                    
                                       • 
                                          Last day of the month before the month of attainment of age 18. or
                                    
                                       • 
                                          Last day of the month before the month of attainment of age 22. | 
                     
                  
                
               Footnotes:
               1 When the claimant attains age 18, some claimants file CDB claims after we terminate his or her Student Benefits. To ensure completion of the 24-month Medicare qualifying period at the earliest possible
                  point, we always establish the exact onset if it is in or after the month of attainment
                  of age 18, or we establish the onset date as the last day of the month before the
                  month of attainment of age 18, if the evidence establishes onset before the month
                  of attainment of age 18, but the exact date is unknown. For more detailed information,
                  see DI 81010.020B.
               2 Either of these dates, or any date before these dates, is fully favorable.
               
               3  If EOD is after AOD, a personalized disability explanation (PDE) is required notifying
                  the claimant of a partially favorable allowance. (See Notifying Claimants of Partially
                  Favorable Allowances DI 25501.280.)