If MEPS already okayed my medical documents, can they go back and try to get more information about your medical situations?

What do you mean by Ok'd ... like you had a consult or something like that? If your medical record is reviewed and past the QC checks and there is no further need for medical waivers , consults .. I would say your done. If you are not past that QC check and they see a error or something , they can for sure ask you for information , if its something you have to provide. Are you concerned over something?

Not sure what you mean - they who? If you mean, can the military follow-up for more information then YES, especially if your initial submission , when reviewed, indicates you may need a medical waiver of some kind...

The answer depends on your progress level in the MEPS process. You took the ASVAB and went in for processing for the Delayed Entry Program (which is where your day starts in Medical testing). When Medical is done with their processing, your paperwork is sent to Operations Processing where your documents are reviewed. If, during this process, they identify a concern which lacks the required supportive documents, they will send it back for the gathering and inclusion of that information. If you have already entered the Delayed Entry Program (indicated by sitting with a clerk, answering interview questions, and being fingerprinted), then the condition may have flagged while preparing your ascension paperwork for taking the oath and shipping off to boot-camp. On the day of your ascension, your medical paperwork is reviewed again for compliance conditions and concerns. If you reached this point expecting to head of to boot-camp and this happened, it is likely that the service liaison or the recruiter failed to provide supportive documents to the condition or get an approved waiver needed to exclude it from consideration. If Medical had made this request as a necessary element to your ascension, they would put a medical hold on your processing until the information is provided. Besides giving you time to get ready for the transition to a new way of life, the Delayed Entry Program (DEP) exists as a means to get waivers and supportive documents reviewed and entered as justifiable support for your Entrance on Duty (When you take the Oath of Enlistment). Once that oath is taken, they have accepted you for what is on record.