A B C D E F G H J K L P Q R S T U V
G1 G2 G3 G4 G5 G6 G7 G8 G9 Ga Gb Gc Ge Gf Gg Gh Gj Gk Gl Gm Gn Go Gp Gq Gt 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.