K4 is a valid 2023 HCPCS Modifier that could be used to indicate Lower extremity prosthesis functional level 4 - has the ability or potential for prosthetic ambulation that exceeds the basic ambulation skills, exhibiting high impact, stress, or energy levels, typical of the prosthetic demands of the child, active adult, or athlete..

K4 Modifier has been in effect since Jan 01, 1997.

Short description for K4 HCPCS Modifier code:

Lwr ext prost functnl lvl 4