Selection of the appropriate date of effect will depend on the nature of the condition, available medical evidence and the member's type of service. The date of effect for a d — isease will be the first of either first medical treatment for the disease, or first date of incapacity or death.
Note that the date of first medical treatment means treatment for that disease. If, for instance, the disease is caused by an original injur — y, the date of effect will still be the date of first medical treatment or incapacity (or death) for that disease, not for the original condition. So for example, if a shoulder injury in 1979 has resulted in osteoarthritis of the shoulder which was first t — reated in 1998 then the date of effect will be 1998 not 1979.