Hi Guest KB! Ever since the S8262 discontinuation June 2015 (which was a code used for several years to represent TMD appliances like the one used for LVI, the neuromuscular orthotic), what we have found is that the code that is most commonly accepted by medical insurers for TMD appliances is D7880. However, some insurers are accepting the other codes listed below as well: D7899 – unspecified TMD therapy, by report 21299 – Unlisted craniofacial and maxillofacial procedure E1399 – Durable medical equipment, miscellaneous (21299 is the only CPT code if that is what the insurer is requiring, the other three are HCPCS codes) A narrative report explaining the treatment accompanying the claim is recommended since they are all “by report”, “unlisted”, or “miscellaneous” codes. Hope this helps, have a great day!