As far as I know, you don't count your committee letter as one of your LOR. Well, at least in my school, they didn't.
Committee collects the LOR and writes a comprehensive letter entailing all of the LOR and your interview with them (if they do interview with you).
Therefore, medical schools either receive 4-5 individual LORs (you sent it your own without going through committee) or 1 LOR from the committee (+other LOR you wish to send after the committee has sent them or w/e).
My school committee required me to get at least 3, preferably 5 LORs, and they sent it to schools (which meant the school received 1 LOR that had 5 LORs in it, if that makes sense).