1 2 3 4 5 7 8 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
G- G. G1 G2 G3 G4 G5 G6 G7 G8 G9 Ga Gb Gc Gd Ge Gf Gg Gh Gi Gj Gk Gl Gm Gn Go Gp Gq Gr Gt Gu Gv Gw Gy Gz

G1

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating most recent urea reduction ratio (URR) reading of less than 60.