I was the Botox Reimbursement Manager and Medical Consultant for an 8 year span, so let me see if I can help. Medicare Carriers typically have a specific policy for the adminstration of and guidleines for the medical necesiity of Botulinum Toxin treatment. This is good indication of what other payers will reimburse. Medicare will allow one injection per site, regardless of the number of injections into that site. A site is defined by Cigna Government Services (NC and Idaho) as a single contiguous body part such as, each eye, a single limb, the face, the neck, etc... It sounds like your payer defines the entire neck as a single contiguous body part but the eyes are separately injectable, for Blepharospasm as an example. Other states I covered would allow bilateral injections in the neck. Research your Medicare policies for a guideline of what other payers will in your state will allow.
Hope that helps,
Jan Plummer