We're a chiropractic office that occasionally provides TENS units. No problems receiving reimbursement for the unit, but have a big problem when billing for the monthly replacement supplies (i.e. electrodes, pads, etc). Using hcpcs A4595. Aetna says it's not "separately reimbursable" and bundles it with the CMT code. Empire BC/BS says they are "unable to pay due to a contractual agreement with the provider". Any thoughts?