QB is a valid 2023 HCPCS Modifier that could be used to indicate Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts exceeds 4 liters per minute (lpm) and portable oxygen is prescribed.

QB Modifier has been in effect since Apr 01, 2018.

Short description for QB HCPCS Modifier code:

Avg day/nite o2 > 4 lpm/port