You might assume that your co-pay is determined solely by the drug you take, but in 2026, it is increasingly determined by the building you walk into. Pharmacy Benefit Managers (PBMs) have aggressively redrawn their “Preferred” and “Standard” network maps, creating a two-tier system that penalizes loyalty to the wrong store. A medication that costs $5 at a “Preferred” chain might cost $20 or $40 at a “Standard” pharmacy just down the street. These network changes often happen quietly at the start of the year, buried in the fine print of your “Evidence of Coverage.” If you haven’t checked your plan’s app recently, you may be paying a “loyalty tax” for shopping at a pharmacy that has fallen out of favor.
