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

G4

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating most recent urea reduction ratio (URR) reading of 70 to 74.9.