Gastric bypass surgery cost in St. Louis, MO
In St. Louis, MO-IL, 4 hospitals list a cash price for laparoscopic Roux-en-Y gastric bypass, standard limb length: from $24,982.72 to $33,595.60, with a median of $26,017.96. The lowest listed price is at Mercy Hospital South — $1,035.24 less than the median here. Across Missouri, the median is $25,239.11 at 10 hospitals.
Cash prices at 4 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 — and —.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in St. Louis, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Hospital South lowest Saint Louis, MO · (314) 525-1000 Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $24,982.72 | $38,434.96 | $1,576.76–$19,595.00 | 35% | — source file |
| Mercy Hospital Washington Washington, MO Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $25,495.50 | $39,223.84 | $3,713.00–$32,851.00 | 35% | — source file |
| Mercy Hospital St Louis Saint Louis, MO Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $26,540.42 | $40,831.42 | $3,897.00–$32,851.00 | 35% | — source file |
| Mercy Hospital Jefferson Festus, MO Laps Gstr Rstcv Px W/Byp Roux-en-Y Limb <150 Cm | $33,595.60 | $51,685.54 | $1,576.76–$18,032.00 | 35% | — source file |
Outpatient: lowest $24,982.72, median $26,017.96, highest $33,595.60 — a 1.3× difference within the same market.
Cash or insurance?
At 2 of 4 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.