Phair Pricing Act of 2019 This bill requires that certain negotiated prices for covered drugs under the Medicare prescription drug benefit be disclosed at the point-of-sale. Specifically, negotiated prices offered under a prescription drug plan (PDP) must be disclosed at the point-of-sale; the disclosed price must include specified adjustments, payments, and fees that are negotiated with the pharmacy (e.g., dispensing fees) by the PDP sponsor or pharmacy benefit manager. Additionally, the Centers for Medicare & Medicaid Services must establish certain quality measures for PDP sponsors to use when determining incentive payments and adjustments (e.g., performance payments) to pharmacies.