I am using 99213 and a 25 modifier for the visit. I'm adding a J1094 and a J1100 - a combination of the long acting & short acting drug, and sending what is listed as the right NDC code for each drug. Coding 1 x 96372 for the administration of the shot. BCBS is denying some of the J1094s as being W21 (the provider must submit the appropriate CDT/CPT/HCPCS code for this service). Do I need another modifier on the J codes?