Sort of a Dis-ed if you do and Dis-ed if you don't on this one.
My mom has a pacemaker and can't do any kind of X-ray/body scanners and has to be hand checked.
Mom can likely go through an x-ray or millimeter wave scanner (says the AHA) but not a traditional metal-detector...
I have an insulin pump and an implanted CGM and am not supposed to do X-ray/body scanners either.
While your CGM should absolutely not get touched by x-rays, but magnetic fields such as used by a traditional metal-detector arch shouldn't bother it.
Of course one should never take life-death advice from strangers on the internet but I'll use this as an opportunity to point out a favorite tactic of physicians giving just this sort of information to their patients.
Doctors prefer to give as little instruction as possible. The thinking is, give the patient fewer things to remember. Let's say there are four distinct technologies employed in walk-through security screening arches. There's probably more, but I can think of the four main ones off the top of my head... so we go with four for now. To the average user of them, all four technologies seem more or less the same. You walk through or you stand within an arch for a few seconds and if you forgot a couple of pennies in your pocket a security guard scowls at you for wasting everyone's time. Of these four technologies, one of them, the magnetometer based metal detector, will screw up your mom's pacemaker. Likewise, one of the four, x-ray backscatter imaging, will wreck your diabetic testing equipment. The other two technologies, active and passive millimeter-wave scanning, almost certainly won't impede the function of either your CGM or your mother's pacemaker.
So a doctor creates a category of activities, using a walk through security scanner, and proscribes that, categorically. This achieves the physician's goal of keeping you alive and he doesn't have to bear the hassle so it's a win-win. I'm not even suggesting this is a bad strategy. But if the doctor isn't telling you exactly what your medical device should avoid and why, you might be subjecting yourself to hardships or lost opportunities that you really don't need to.
Sometimes they just don't know, or don't feel like they need to explain themselves. For example, I asked a half dozen or more physicians and specialists, by what action does an x-ray scanner damage diabetic testing equipment before I got an actual or correct answer. X-Rays are ionizing radiation, glucometers function by measuring an electrical reaction between an oxygen sensor and an oxidase catalyst reagent. Ionizing radiation will alter, both, how the reagent reacts and how the sensor is calibrated. Now I can ask if millimeter-wave body scanners affect the equipment in the same way. Medical specialist gets back to me and says they shouldn't. MM-Wave is at the other end of the spectrum, and is non-ionizing. Cool. Now we know.
I'm not trying to sew doubt in one's healthcare professionals. They are the best source of the safest, simplest approach. But pressing them for a more thorough explanation can pay dividends.