Look up US drug pricing from CMS NADAC (National Average Drug Acquisition Cost) — the benchmark per-unit acquisition cost CMS surveys from retail pharmacies and publishes weekly. Pass ndc (11-digit National Drug Code) for an exact product, or name (drug name/description keyword, e.g. 'atorvastatin 10 mg') to search. Returns rows with the NDC, description, nadacPerUnit (USD per pricing unit), pricingUnit (EA/ML/GM), effectiveDate, OTC flag, and brand/generic classification — most recent effective date first. Real surveyed acquisition costs instead of model-guessed prices. Public domain; the current-year dataset is resolved automatically. NADAC is an acquisition-cost benchmark, not a retail or insured price.