Verkkounder the new model, cvs’s more than 9,000 pharmacies will have a reimbursement rate that defines the cost of the drug using a “transparent formula”. Cvs, the largest retail pharmacy chain in the country, is ditching the opaque formulas that currently determine drug prices. Verkkocvs health will change how it reimburses pharmacies for prescription drugs, which it says will make pricing simpler — and which could change how.