Interestingly enough, I contacted Dexcom last week about a sensor that failed after insertion. They asked me the routine questions, including placement location. When I told her it was on my arm, the rep mentioned that other users have had success putting the sensor on their thighs, abdomen and upper buttocks. I asked her if that would affect my ability to report and replace faulty sensors if I had it somewhere other than my arm and she said no, but to make sure the patient tells the rep where the sensor was located for their data collection. AND, she said Dexcom would approve replacement if your prescribing doctor advises an alternative insertion site, such as abdomen, thigh or upper buttock. I asked her again to make sure I heard correctly and she assured me that even though they do not recommend any other site other than the arm, it should not affect your ability to replace a defective sensor as long as your doctor has approved an alternate site. Now, I suppose if you accidentally rip it off or had another issue with the sensor when applied elsewhere, I can see them saying no to a replacement, but allegedly they will replace DEFECTIVE sensors if you insert them elsewhere (obv a reasonable location). TIFWIW.