[Histonet] ihc billing

[Hutton, Allison]

Would anybody be able to shed some light on the 2014 updated IHC billing.  I understand the 88342 and 88343 codes but am looking for some clarification on the G0461 and G0462 codes.  Do these pertain to multiple antibodies on one slide as the 88343 does or is the G0461 for the 1st antibody and G0462 for all remaining antibodies performed for one specimen site?
Thank you in advance
Allison