Gastric bypass surgery cost in Chicago, IL
In Chicago-Naperville-Elgin, IL-IN, 3 hospitals list a cash price for laparoscopic Roux-en-Y gastric bypass, standard limb length: from $48,023.54 to $103,066.49, with a median of $85,119.24. The lowest listed price is at Northwestern Medicine McHenry Hospital — $37,095.70 less than the median here. Across Illinois, the median is $4,255.20 at 7 hospitals.
Cash prices at 3 facilities across 3 cities for code 43644, 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 Apr 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 |
|---|---|---|---|---|---|
| Northwestern Medicine McHenry Hospital lowest McHenry, IL · (815) 344-5000 Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $48,023.54 | $68,605.06 | $7,055.00–$7,839.00 | 30% | Apr 1, 2026 source file |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $85,119.24 | $121,598.91 | $700.00–$7,839.00 | 30% | Apr 1, 2026 source file |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $103,066.49 | $147,237.84 | $425.00–$695.00 | 30% | Apr 1, 2026 source file |
Outpatient: lowest $48,023.54, median $85,119.24, highest $103,066.49 — a 2.1× difference within the same market.
Cash or insurance?
At 0 of 3 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
A Roux-en-Y gastric bypass creates a small stomach pouch and connects it directly to the small intestine, so food bypasses most of the stomach. It is a weight-loss (bariatric) operation that also often improves type 2 diabetes and reflux.
What the price covers
The facility price usually covers the operating room and recovery and may not include the hospital stay. The surgeon, anesthesia, pre-surgery tests and follow-up visits are usually billed separately.