Tonsil and adenoid removal, 12+ cost in St. Louis, MO
In St. Louis, MO-IL, 4 hospitals list a cash price for tonsil and adenoid removal, age 12 or older: from $5,799.79 to $10,264.87, with a median of $7,297.66. The lowest listed price is at Mercy Hospital Washington — $1,497.87 less than the median here. Across Missouri, the median is $6,108.21 at 12 hospitals.
Cash prices at 4 facilities across 3 cities for code 42821, 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 Washington lowest Washington, MO Tonsillectomy & Adenoidectomy Age 12/> | $5,799.79 | $8,922.75 | $252.90–$3,511.11 | 35% | — source file |
| Mercy Hospital St Louis Saint Louis, MO Tonsillectomy & Adenoidectomy Age 12/> | $6,416.63 | $9,871.74 | $263.22–$3,594.05 | 35% | — source file |
| Mercy Hospital Jefferson Festus, MO Tonsillectomy & Adenoidectomy Age 12/> | $8,178.68 | $12,582.59 | $263.22–$3,594.05 | 35% | — source file |
| Mercy Hospital South Saint Louis, MO · (314) 525-1000 Tonsillectomy & Adenoidectomy Age 12/> | $10,264.87 | $15,792.11 | $263.22–$3,594.05 | 35% | — source file |
Outpatient: lowest $5,799.79, median $7,297.66, highest $10,264.87 — a 1.8× difference within the same market.
Cash or insurance?
At 0 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
This is surgery to remove both the tonsils and the adenoids in someone age 12 or older. It is done for repeated infections or for snoring and breathing problems during sleep caused by enlarged tonsils and adenoids.
What the price covers
The facility price covers the operating room and recovery. The surgeon's fee and anesthesia are usually billed separately.