Why did Jason Bourne put a laser with his bank account number in his body

I personally think the implant of the laser was to reveal Bourns own identity to himself if any accident happens.

It was likely from the beginning that Bourne may get amnesia due to the drug effect. So if anything of that happens, he can get back his identity easily(Like the movie went on). Maybe they thought, it will create pain in the implanted area and he would eventually find it. But I guess, his employer did not think that after committing to the plan, he would turn against them.

The doctor found the laser because he wanted to examine an severely wounded body thoroughly. So he found the scar, felt something inside it and made it out.