Sinus surgery, full ethmoid cost in Chicago, IL
In Chicago-Naperville-Elgin, IL-IN, 8 hospitals list a cash price for endoscopic sinus surgery: full ethmoid sinus opening: from $7,525.00 to $45,469.83, with a median of $31,787.20. The lowest listed price is at Mercy Medical Center and 1 other hospital — $24,262.20 less than the median here. Across Illinois, the median is $18,479.88 at 12 hospitals.
Cash prices at 8 facilities across 8 cities for code 31255, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Sep 1, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Chicago-Naperville-Elgin, IL-IN.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Medical Center lowest Aurora, IL · (630) 859-2222 Nsl/sins ndsc w/tot ethmdct | $7,525.00 | $28,587.00 | $297.25–$28,587.00 | 74% | Sep 1, 2026 source file |
| Saint Francis Hospital lowest Evanston, IL · (847) 316-4000 NASALSINUS ENDOSCOPY SURGICAL | $7,525.00 | $9,720.00 | $310.29–$9,720.00 | 23% | Sep 1, 2026 source file |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 Nasal/Sinus Ndsc W/Total Ethoidectomy | $29,434.75 | $42,049.64 | $5,282.00–$5,868.00 | 30% | Apr 1, 2026 source file |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 Nasal/Sinus Ndsc W/Total Ethoidectomy | $30,192.25 | $43,131.79 | $2,325.00–$5,868.00 | 30% | Apr 1, 2026 source file |
| Northwestern Medicine Kishwaukee Hospital DeKalb, IL · (815) 756-1521 Nasal/Sinus Ndsc W/Total Ethoidectomy | $33,382.15 | $47,688.79 | — | 30% | Apr 1, 2026 source file |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 Nasal/Sinus Ndsc W/Total Ethoidectomy | $43,276.43 | $61,823.47 | $4,551.00–$5,868.00 | 30% | Apr 1, 2026 source file |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 Nasal/Sinus Ndsc W/Total Ethoidectomy | $44,043.97 | $62,919.96 | — | 30% | Apr 1, 2026 source file |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 Nasal/Sinus Ndsc W/Total Ethoidectomy | $45,469.83 | $64,956.90 | $7,923.00–$8,802.00 | 30% | Apr 1, 2026 source file |
Outpatient: lowest $7,525.00, median $31,787.20, highest $45,469.83 — a 6.0× difference within the same market.
Cash or insurance?
At 2 of 6 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What it is
This code covers endoscopic surgery through the nose to open all of the ethmoid sinuses, between the eyes.
What the price covers
The hospital price usually covers the operating room, recovery and supplies. The surgeon and anesthesia usually bill separately.