LH ▼ -4.2% - Labcorp Holdings Inc. $LH DGX Quest Diagnostics, Labcorp Fall After CMS Proposes Up To 15% Annual Medicare Lab Reimbursement Cuts Labcorp shares fell 4.2% after the Centers for Medicare & Medicaid Services proposed cutting Medicare reimbursement rates for laboratory services by up to 15% annually. The proposed reduction directly threatens a significant revenue stream for the clinical laboratory company, as Medicare represents a major portion of lab testing volumes and payments across the industry. 21-SEP-2026 04:58 PM ET