I have no personal experience with this, but I have heard if your Doc puts AAS in your medical record, and lets say months even years down the road you get sick... have a stroke or something and you try and claim insurance, your insurance company might not pay because
"patient has a record of illegal substance use in 2012, the illegal compounds in question could be linked to patients current illness therefore we are unable to pay for patients....etc"
Now I dont know this for a fact, but Im not going to risk it by telling my doc. There was a thread on this way back and a lot of people here have told their doctor about their AAS use. Hopefully more will chime in as I only have theories.