Is this a Lidolog "kit" that comes with Kenalog, lidocaine, and some other supplies in it that are used when giving a cortisone injection? The NDC # you provided seems to indicate that, as well as the rep stating it is a convenience kit.
If so, the first problem is when giving a therapeutic injection, you cannot bill for the lidocaine, only for the Kenalog. So it looks like they want you to bill for the Kenalog only, using the appropriate J code, which is J3301.
The next problem is the rest of the stuff in the kit(gloves, swabsticks, bandage, gauze) are not reimbursable, they are considered to be normal supplies used in doing an injection, and are factored into the RVU's for the injection code.
In 2015, I saw a bunch of questions about these kits, using that NDC #, on another billing site, and the consensus was that it was a scam by the manufacturers to get doctors to purchase them, and that while insurances might initially pay for them, they would eventually get smart and stop paying for them. Sure enough, that is what is happening.
I think you may be out of luck, if we are talking about those kits. The only thing payable in them is the Kenalog, which has the J code I mentioned above.