Published October 10, 2026
Does NADAC apply to brand name drugs? Yes. This is the first thing most people get wrong about the National Average Drug Acquisition Cost: they assume it is a generics-only number. It is not. The Centers for Medicare and Medicaid Services calculates and publishes NADACs for brand drugs too, right alongside the generic ones, and most state Medicaid programs reimburse brands off it the same way. The brand side just gets calculated differently, updated differently, and means something slightly different in practice.
The split lives in how CMS categorizes every drug. Single-source and innovator drugs, the 'S' and 'I' categories, get the brand NADAC. Non-innovator drugs, category 'N', get the generic NADAC. Within a drug grouping, there is generally one brand NADAC covering all the 'S' and 'I' NDCs, and one generic NADAC covering all the 'N' NDCs. That grouping is the quiet workhorse of the whole file: when five companies sell the same brand drug, their NDCs roll up into a single brand NADAC, and when thirty companies sell the generic, those roll up into a single generic NADAC. States can apply their own brand or generic designations on top of this when they reimburse, but the file itself draws the line.
Why brand NADACs update on a different schedule
Here is the part the methodology document spells out and almost nobody reads. Generic NADACs come from monthly pharmacy invoice surveys, because generic prices move constantly and you need fresh survey data to track them. Brand NADACs are reviewed and adjusted weekly based on changes in published prices, because brand prices barely move on invoice, so tracking published price changes is the cheaper signal. The documented rule: if the published price for a brand drug rises 5%, the NADAC rises 5%. CMS tracks the correlation between published brand prices and surveyed brand acquisition costs to keep that relationship honest, and the 46brooklyn research group has verified it in the wild, documenting a brand drug whose per-unit NADAC jumped 230% in the same week its published price did.
What this means in practice is that brand NADACs are smoother and more predictable than generic ones. A generic can swing 50% in a survey week when a new manufacturer enters. A brand moves when the manufacturer raises the price, and you will see it the next week. If you are a pharmacy buyer watching your margins, the brand NADAC is the number you can plan around.
How states actually use it for brands
The Medicaid state table on medicaid.gov shows how this plays out. Louisiana reimburses brand ingredient cost at the lower of NADAC, WAC, or usual and customary, and generics at the lower of NADAC, WAC, the federal upper limit, or usual and customary. Maine uses the lower of NADAC, WAC, state MAC, submitted ingredient cost, and more, with different discounts off AWP for brands versus generics. The pattern across states is the same: NADAC is the benchmark, then the state takes the lowest number among several and pays that, plus a professional dispensing fee. Brands get the same treatment as generics, just against a brand NADAC baseline.
Two edge cases reveal how carefully CMS draws the brand line. Authorized generics, the ones made by the brand manufacturer and sold as generics, are listed as innovator drugs in the rebate file but get grouped as generics for NADAC, because states reimburse them as generics. Going the other way, proprietary named drugs approved under abbreviated applications but priced like brands get grouped as brands for NADAC, shown with a 'B-ANDA' indicator. Biosimilars are classified as brand for rate setting. The file follows how the drug is actually priced and paid, not how the FDA paperwork labels it.
Frequently asked questions
Does NADAC cover brand-name drugs?
Yes. CMS publishes brand NADACs for single-source and innovator ('S' and 'I') drugs alongside generic NADACs for non-innovator ('N') drugs. Most state Medicaid programs use NADAC for brand ingredient-cost reimbursement as well.
How often are brand NADACs updated?
Brand NADACs are reviewed and adjusted weekly based on changes in published prices, so a manufacturer's price increase typically shows up the next week. Generic NADACs update from monthly pharmacy invoice surveys.
Do brand NADACs include manufacturer rebates?
No. NADAC is built from invoice prices pharmacies paid, and rebates and off-invoice discounts are excluded for brands and generics alike. The true net cost of a brand after rebates sits below its NADAC.
Why is a brand NADAC different from the generic NADAC for the same drug?
Because they are separate groupings with separate calculations. The brand NADAC covers the innovator NDCs and updates weekly off published prices; the generic NADAC covers the non-innovator NDCs and updates from monthly invoice surveys. Same ingredient, two different benchmarks.
See the real numbers: look up what pharmacies actually paid for your prescriptions, brand or generic, in the NADAC Drug Price Lookup.
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