Your ID number stays with you for your entire life, so your Basic Skills membership will be converted to a full USFSA membership.
Are you sure? I had to get a Basic Skills membership to take a class at our rink and it is a completely different number and membership than my USFSA number which I have had for twenty years (not sure if they went back to my old number from the 60s when I re-joined in '89... or is it that if you sign up for Basic Skills membership and then go on to full membership (or whatever they call it) then you just keep the same number?
Yes, I'm sure. I handled the Club and skate school registrations at various points. Your skating school made a mistake. Part of the process is to indicate renewal vs. new registration. The school chose the latter. The USFSA does try to ferret out duplicates by matching name and address, but mistakes do happen. Of course, if you've changed your name or moved, it's much more likely. If a skater already has a number, that's the one the Club and skate schools are supposed to use. You can, btw, belong to more than one Basic Skills skating school and/or Club. There are skaters registered for one skate school in NJ, another in NY, one Home Club plus another skating club as an associate.
You have be registered for each separately, but you use the same number. It's not liability insurance, there's a small group
accident insurance policy that covers every skater and coach enrolled for that program. You don't have to have a Basic Skills-category membership (although they'll send you a separate card), it's that you have to be on their roster for coverage in the event of an accident. Some schools try to save the per-student fee by not doing the registrations, but they collect the fees from students anyway.
I've had the same USFSA number since the late 1970's/early 1980's. I let my membership lapse for a few years. When I was coaxed back into skating and coaching, our skating director contacted the USFSA to resurrect my original membership number. Per the program rules, the SD registered me as a Basic Skills Instructor. I've since become an individual, then a Club/family member. Coolest thing: all of my tests were resurrected! I don't even remember TAKING the Dutch Waltz dance test, but there it is on my online profile! I love it when people do a double-take at how few digits I have in my ID number, lol.
You can ask the USFSA to locate and merge your ID numbers into a single record. If you join the USFSA after the season starts, you can write and ask copies of the back issues of Skating magazine that you missed - they're included in your membership fee, so they've always sent them to me free of charge.
As for the LTS classes, the skating school will register you regardless of the type of membership you have with the USFSA. They just register you as a member of their program. Your individual or Club membership ID # will remain the same. I don't know of any skating school that would turn away a skater because they belonged to the USFSA already. Check with them, but I'm certain it won't be an issue.