It's similar to Botox but may have some safety advantages, and is the only agent with this indication, so that may make reimbursement easier to obtain.
It should be covered by Medicare same as any other injection you'd get at the doctor's office -- probably an office visit charge + the units of the drug (which bills for about $5/unit). Merz also has an assistance program for people not covered by Medicare/Medicaid in case someone here falls into that category.