Billing and Coding: GlycoMark Testing for Glycemic Control

GlycoMark testing is subject to LCD L36864 and may be denied when billed with CPT 84378 or 84999; statutorily excluded GlycoMark services are excluded and do not require an Advance Beneficiary Notice (ABN). For claims processing, submit CPT 84378 or 84999 to receive denial, append modifier GX for a voluntarily issued ABN and modifier GY to indicate a statutorily excluded service.