I work at a doctors office and we have an in house lab. We had been billing g0431 x9 and g0431 x3 with a 59. This had been paid up until july 1, 2010. The mues are updated each quarter, but the mue amount for this cpt code is still confidential. Dose anyone know what the new max is or a better way for us to code g0431? Also medicare just loaded mod 91 to their system, should we be using this mod instead of 59? ThANKS