Chargemaster (Charge Description Master)

How It Works

The chargemaster is the starting point for hospital billing, but its prices are widely regarded as arbitrary and inflated. Chargemaster prices are typically 3-10 times what Medicare actually pays. Most insured patients never pay chargemaster rates because their insurer has negotiated lower rates. However, uninsured patients have historically been billed at full chargemaster prices — a practice that has led to devastating medical bills. The Hospital Price Transparency rule (effective 2021) now requires hospitals to publish their chargemaster and negotiated rates, making these prices publicly visible for the first time.

Related Terms

• Diagnosis Related Group (DRG) — A classification system that groups hospital inpatient stays into categories based on diagnosis, procedures, and patient complexity — used by Medicare to determine how much a hospital gets paid.
• Hospital Price Transparency — A federal rule (effective January 2021) requiring all U.S. hospitals to publicly display their prices — including chargemaster rates, negotiated rates with each insurer, and cash-pay discounts.
• Surprise Medical Bill (Balance Billing) — An unexpected bill from an out-of-network provider — often occurring during emergencies or when an in-network hospital uses out-of-network specialists without the patient's knowledge.