Rapid flu test cost in St. Louis, MO — inpatient
In St. Louis, MO-IL, 10 hospitals list a cash price for rapid flu test (influenza antigen) as an inpatient: from $30.75 to $224.64, with a median of $131.36. The lowest listed price is at Mercy Hospital Lincoln and 1 other hospital — $100.61 less than the median here. Across Missouri, the median is $53.30 at 29 hospitals.
Cash prices at 10 facilities across 10 cities for code 87804, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Mar 16, 2026 and Jun 12, 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 St. Louis, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Hospital Lincoln lowest Elsberry, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospitals East Communities lowest Washington, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$34.85 | 25% | Jun 12, 2026 source file |
| Mercy Hospitals East Communities lowest Washington, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$34.85 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO Iaadiadoo Influenza | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Lincoln lowest Elsberry, MO POC Influenza Rapid Screen Oia | $30.75 | $41.00 | $20.50–$36.90 | 25% | Jun 12, 2026 source file |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 INFLUENZA SWAB A&B | $39.72 | $66.20 | $66.20 | 40% | — source file |
| Mercy Rehabilitation Hospital South Louis, MO INF AG DET BY IA INFLUENZA | $57.35 | $57.35 | $57.35 | — | Mar 16, 2026 source file |
| Ranken Jordan Home for Convalescent Crippled Children Hospital Maryland Heights, MO · (314) 872-6400 Influenza A and B Antigen Immunoassay | $130.24 | $162.80 | — | 20% | Apr 24, 2026 source file |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 HC QL INFLUENZA A/B | $132.48 | $184.00 | $7.78–$184.00 | 28% | — source file |
| Mercy Rehabilitation Hospital St. Louis Chesterfield, MO INF AG DET BY IA INFLUENZA | $158.07 | $158.07 | $158.07 | — | Mar 16, 2026 source file |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL HC QL INFLUENZA A/B | $186.48 | $259.00 | $7.41–$259.00 | 28% | — source file |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 HC QL INFLUENZA A/B | $193.68 | $269.00 | $7.41–$269.00 | 28% | — source file |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 HC QL INFLUENZA A/B | $224.64 | $312.00 | $17.24–$312.00 | 28% | — source file |
Inpatient: lowest $30.75, median $131.36, highest $224.64 — a 7.3× difference within the same market.
As an outpatient, the same code is billed by 14 facilities here, median $86.28 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 7 of 9 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
A rapid flu test checks a nose or throat swab for influenza within minutes. The code is billed once for each flu type tested, so a test for A and B may be billed twice.
What the price covers
The price usually covers the swab and the test for one flu type; tests for A and B may be billed twice.