Chargemaster (Charge Description Master)
A hospital's master list of prices for every item and service, from a single aspirin to a heart transplant, typically containing tens of thousands of line items with prices that bear little relation to actual costs.
Chargemaster (Charge Description Master) is a term from U.S. hospital cost and quality reporting — the field that produces the CMS Hospital Compare program, the Medicare Inpatient Payment files, and the patient-facing tools built on top of them. The definition below covers what the term means in CMS files, what it does not mean, and how it interacts with the other measures CMS publishes. On the LakeQuality value rubric, Chargemaster (Charge Description Master) is one of the inputs (directly or indirectly) to the combined cost-and-quality grade. Understanding how the term is computed at CMS — what counts and what does not — is part of reading hospital pages defensibly.
Each hospital page on LakeQuality surfaces the specific Chargemaster (Charge Description Master) value for that facility (when CMS reports one), so the general definition here translates into a concrete data point on the per-hospital pages you actually use.
How It Works
The chargemaster, also called the Charge Description Master (CDM), is the internal pricing database that drives hospital billing. A typical community hospital chargemaster contains 20,000-45,000 line items; an academic medical center like UPMC, NewYork-Presbyterian, or Cedars-Sinai may maintain over 70,000. Each line ties a Healthcare Common Procedure Coding System (HCPCS) or CPT code to a gross charge. Chargemaster prices routinely run 3-10x what Medicare actually pays and 2-4x commercial negotiated rates. A knee replacement with chargemaster price of $85,000 might have a Blue Cross negotiated rate of $24,000, a Medicare DRG payment of $14,500, and a Medicaid payment of $9,000. A single Tylenol tablet has appeared on chargemasters at $15-$37. Most insured patients never pay these rates because carriers negotiate discounts of 40-75%, but uninsured patients historically received bills at full chargemaster prices, a practice that drove medical bankruptcies and spurred charity-care mandates under the ACA. The Hospital Price Transparency Rule, effective January 1, 2021, now requires every hospital to publish its chargemaster plus payer-specific negotiated rates in a machine-readable file. CMS raised noncompliance penalties from the original $300/day (2021) to a sliding scale based on bed count, reaching $5,500+/day for hospitals with 550+ beds as of January 2024. Even so, PatientRightsAdvocate.org audits show only about 36% of hospitals are fully compliant. The data already published reveals extreme variation: the same DRG can be priced 5-15x higher at one hospital than the one across town.
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 1, 2021) requiring all U.S. hospitals to publicly display their prices, including chargemaster rates, negotiated rates with each insurer, and cash-pay discounts.
- Machine-Readable File (MRF), The comprehensive hospital pricing file, required by the Hospital Price Transparency Rule, containing gross charges, cash prices, and payer-specific negotiated rates for every item and service.
- Negotiated Rate, The payer-specific price a hospital has agreed to accept from a particular insurance plan for a service, usually 30-60% below the chargemaster gross charge.
- Cash-Pay Rate (Discounted Cash Price), The price a hospital charges self-pay or uninsured patients who pay directly, often substantially lower than both the chargemaster and some commercial negotiated rates.
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About This Definition
This definition is part of the HospitalCostData Hospital Pricing Glossary, 47 terms explaining hospital costs, quality ratings, and healthcare billing. Written for patients, journalists, researchers, and healthcare professionals.