I lied at MEPS. Will they go back and look through my medical records?

Do they already know about those medical records? If not, they might know now that you've posted this online.

First, let you chain of command know. It won't change you military status, but will help you morally become a better person. Second, military medical can't even keep track of their own medical records, they aren't going to dig through your civilian record. In fact your medical records from when you where six have most likely been destroyed.

Yes they will look at the medical files. That said you need to be honest and explain this to your recruiter. He will understand that you really want to join, if it is as minor as the doctor said then this will not stop you from joining though it might limit your choices of MOS. A heart murmur is when a heart valve doesn’t close. This can cause a lower oxygen level. So heavy exertion can lead to a heart attack. If that happens it is possible for the Army to void out your contract because you lied. Not only would you be chaptered but you would have to pay back any money paid from a false enlistment. Better to be honest now than to face that latter.

Well, first thing is you lied. Yeah you came clean here, but this is a partially public forum and now everyone knows you lied. What will you lie about next time it suits you? I personally think they should kick you out, cause you can't be trusted to tell the truth.

On the heart murmur, mine started after duty in Iraq. It was entered in my medical records, but I did not have a profile for it. I don't know your medical condition, only a Doctor can make that decision. If your Command retains you, you'll be a lucky SOB, but my recommendation still stands.

If it is determined in the future that you misrepresented a previous condition, your enlistment contract can be invalidated.

Of course they will look back on it, you might want bring this up before they find out. Had to mentioned it initially, you might have been able to put in for a medical waiver( i haven't been a recruiter for years, I'm not sure if that quailifies for a waiver) now you have lied after you swore that all of your answers were correct. Especially since you admitted to it in a public forum.

Ok, 1. You lied. 2. You lied on official documents. 3. You lied to get in the military.
You expect to maintain integrity in the military by lying at the entry point? It is best to just fess it up at any medical facility and get it over with - Integrity, it stays with you.

@John Kellan. I can relate, mainly because I have the same diagnosis, i.e., a heart murmur since birth (every doctor with a statoscope to my chest reports hearing a "whishing" sound). Heart murmur was noted during initial Army physical. Then upon physical for Special Forces Officer Course (SFOC) the doctor flags my records for "discovering" heart murmur which he claims is a disqualifier for SFOC. I ask for a review, stating that Ranger School, Jump School, IOBC, IOAC, and overseas Infantry deployments were all performed with the same pre-existing condition. So back to your question, in my opinion, you are not required to do anything (or even worry about it). Sounds counter-intuitive, but the less you tell the medical people the better it is for you long term career wise.

Jesus man get some street smarts real fast or the E-4 Mafia will eat you alive