Direct Billing is
generally referred to as the practice of sending invoices for
autoglass repair and replacement directly to the insurance company,
in lieu of a designated network.
The process of
direct billing started taking a back seat when networks and third
party administrators (TPA's) became more prevalent in the 1980's,
offering consistent bulk discount pricing and electronic billing to
the insurance companies.
The networks
'signed up' glass shops, who invoice the networks, who in turn bill
the insurance company. Most of you know the rest of the story.
Here
are some links to information on this practice.