LR

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating laboratory round-trip service.

LS

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating a U.S. Food and Drug Administration–monitored intraocular lens implant.

LT

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating procedures performed on the left side of the body.

LVN

Abbreviation that means licensed vocational nurse/licensed visiting nurse. See licensed practical nurse (LPN) .

Lysis

1. Breakdown, decomposition, destruction, or dissolution of a cell or molecule through the action of a specific agent such as lysin. 2. Slow and steady lessening of the symptoms of a disease.