C. diff test cost in St. Louis, MO
In St. Louis, MO-IL, 11 hospitals list a cash price for C. difficile toxin gene test (stool PCR): from $72.80 to $235.44, with a median of $158.40. The lowest listed price is at Mercy Hospital South — $85.60 less than the median here. Across Missouri, the median is $157.95 at 27 hospitals.
Cash prices at 11 facilities across 9 cities for code 87493, 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 Clostridium Difficile Amp Probe | $72.80 | $112.00 | $33.54–$83.86 | 35% | — source file |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL HC CLOSTRIDUM DIFFICILE | $98.64 | $137.00 | $30.13–$137.00 | 28% | — source file |
| Mercy Hospital Jefferson Festus, MO Clostridium Difficile Amp Probe | $140.40 | $216.00 | $33.54–$83.86 | 35% | — source file |
| Mercy Hospital Washington Washington, MO Clostridium Difficile Amp Probe | $140.40 | $216.00 | $33.54–$59.36 | 35% | — source file |
| Mercy Hospital Lincoln Troy, MO · (636) 528-8551 Clostridium Difficile Amp Probe | $157.95 | $243.00 | $37.27–$51.65 | 35% | — source file |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 C DIFF AMPLIFIED PROBE | $158.40 | $220.00 | $31.63–$220.00 | 28% | — source file |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 HC CLOSTRIDUM DIFFICILE | $185.76 | $258.00 | $51.60–$258.00 | 28% | — source file |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 C DIFF AMPLI PROBE | $188.11 | $313.51 | $313.51 | 40% | — source file |
| Mercy Hospital St Louis Saint Louis, MO Clostridium Difficile Amp Probe | $193.05 | $297.00 | $33.54–$83.86 | 35% | — source file |
| Shriners Childrens - St Louis Saint Louis, MO · (314) 432-3600 C DIFF AMPLIFIED PROBE | $197.20 | $197.20 | $30.16–$60.30 | — | — source file |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 C DIFF AMPLIFIED PROBE | $235.44 | $327.00 | $30.13–$327.00 | 28% | — source file |
Outpatient: lowest $72.80, median $158.40, highest $235.44 — a 3.2× difference within the same market.
As an inpatient, the same code is billed by 7 facilities here, median $185.76. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
Cash or insurance?
At 6 of 11 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 it is 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 stool test looks for the toxin gene of Clostridioides difficile, a cause of severe diarrhea, often after antibiotics or a hospital stay.
What the price covers
The price usually covers running the stool test; the collection kit is often included.