# Hip or knee replacement (hospital stay): what HAP pays, by state

The whole hospital stay for a hip or knee joint replacement, without major complications - the most common inpatient surgery.

- Insurer: HAP (Health Alliance Plan)
- Billing code: 470 (Hospital stays (inpatient))
- Price shown: negotiated in-network price, hospital stay, facility fee
- Prices as of: 2026-10-01
- All of the insurer's plans pooled; the map also shows single networks

| State | Providers | Lowest | 25th pct | Median | 75th pct | Highest | Medicare pays | Median vs Medicare |
|---|---|---|---|---|---|---|---|---|
| Illinois | 1 | $15,778.38 | $15,778.38 | $15,778.38 | $15,778.38 | $15,778.38 | $16,408.49 | about what Medicare pays |
| Michigan | 115 | $13,468.71 | $20,116.05 | $25,324.52 | $29,238.26 | $36,712.75 | $16,186.18 | 1.6x Medicare |
| Ohio | 1 | $25,324.52 | $25,324.52 | $25,324.52 | $25,324.52 | $25,324.52 | $14,131.56 | 1.8x Medicare |

**“x Medicare”** compares each price with what original Medicare actually paid hospitals in the same state for the same kind of stay in 2024, the newest year it has published: the average per stay, the patient’s share included, at hospitals with more than ten such stays. Medicare’s payment varies by hospital (wages, teaching, low-income patients), so this is a state average, not any one hospital’s rate. Insurers write their contracts as a share of Medicare, so 1.3x means the insurer pays 30% more than Medicare would; Medicare Advantage plans generally pay close to 1.0x.

Prices are what the insurer has agreed to pay, not what you will be billed. This is a statewide summary: prices vary far more between towns and between practices than these medians suggest, and "providers" counts everyone with a contracted price, not only those who perform the procedure.

Map: https://medicalpricetransparency.netlify.app/insurers/hap/statemap_470_US.html  
About this insurer's data, and its other procedures: [index.md](index.md)