G-codes are quality data codes that rehab therapy providers—including eligible physical therapists, occupational therapists, and speech-language pathologists—include on their Medicare claim forms to fulfill requirements for PQRS and functional limitation reporting (although codes for PQRS and FLR are different and distinct). CMS uses these codes to track information about Medicare beneficiaries’ function and condition. To remain FLR-compliant, therapists must report G-codes—along with their corresponding severity modifiers and therapy modifier—at the initial examination, at minimum every tenth visit (or progress note), and at discharge.