Hospitals have a 'chargemaster' with prices for every service. Almost nobody pays those prices. Here's how hospital billing actually works — the negotiated rates, the surprise bills, and why a $20 aspirin makes sense in context.
Educational content only — not personalized financial, legal, or tax advice.
Every hospital maintains a 'chargemaster' — a master price list for every service, procedure, medication, and supply the hospital provides. Chargemaster prices are the starting point for billing but bear no relationship to what most patients or insurers actually pay. A hospital might charge $50 for an aspirin on the chargemaster; Medicare pays $0.50; a commercial insurer pays $2; an uninsured patient gets billed $50 and is expected to negotiate or apply for charity care.
Chargemaster prices exist for historical and administrative reasons. When Medicare adopted cost-based reimbursement in the 1960s, hospitals needed a starting price list. The chargemaster became the anchor for all negotiations. Over time, as hospitals competed for insurer contracts by offering larger discounts from chargemaster, the chargemaster prices became increasingly detached from reality — the larger the stated discount, the better the deal looks, even if the actual negotiated price is unchanged.
This connects to why U.S. healthcare costs 2x other countries and the structural reasons for high prices](/article/why-u-s-healthcare-costs-2x-other-countries) and to health insurance economics and how insurers make money.
For a $10,000 chargemaster hospital service, here's who pays what:
Medicare: Pays approximately $4,000-5,000 based on DRG (Diagnosis-Related Group) — a fixed payment per admission category regardless of chargemaster price.
Commercial insurer (large employer plan): Pays approximately $7,000-8,000 — negotiated as a percentage of Medicare rates or as a discount from chargemaster. Large insurers with significant market share negotiate better rates; smaller plans pay more.
Medicaid: Pays approximately $2,500-3,500 — the lowest of any payer, often below cost.
Uninsured/self-pay: Billed at chargemaster ($10,000). Most hospitals apply 'charity care' policies that reduce or eliminate bills for patients below certain income thresholds. What uninsured patients actually pay depends heavily on whether they know to ask for financial assistance and whether the hospital's charity care policies are applied. Uninsured patients who don't negotiate often receive the worst terms.
Surprise billing — a patient receives care at an in-network hospital but is treated by an out-of-network physician (ER doctors, anesthesiologists, radiologists who contract independently) and receives an unexpected bill — was a significant consumer harm that led to legislation.
The No Surprises Act (effective January 2022) generally prohibits out-of-network providers from billing patients more than in-network cost-sharing for:
Disputes between insurers and providers go to independent dispute resolution (IDR). Provider groups challenged the IDR rules in court, arguing that the benchmark rate (based on median in-network rates) was too low. Multiple court decisions have modified implementation, but the core consumer protection remains.
CMS rules effective January 2021 require hospitals to publish their negotiated rates with all payers in machine-readable format. The intent: allow patients (and researchers) to comparison shop.
Reality: compliance has been incomplete. A 2023 Patient Rights Advocate report found only 21.4% of hospitals fully complied. Published data is often in technically compliant but practically unusable formats. Negotiated rates vary enormously — the same MRI at the same hospital might cost $450 under one employer plan and $1,800 under another, depending on the insurer's negotiating leverage.
The transparency data, where usable, has revealed price variation that contradicts efficient market assumptions: hospitals in the same city charge dramatically different prices for identical services, with no clear correlation to quality.