C-peptide test cost in Kankakee, IL
In Kankakee, IL, 1 hospital lists a cash price for C-peptide blood test: from $9.32 to $9.32, with a median of $9.32. Across Illinois, the median is $103.60 at 100 hospitals.
Cash prices at 1 facility for code 84681, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 22, 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 Kankakee, IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Riverside Medical Center lowest Kankakee, IL · (815) 933-1671 ASSAY OF C-PEPTIDE source file | $9.32 | $35.00 | $20.81–$292.65 | 73% |
| Riverside Medical Center Kankakee, IL · (815) 933-1671 C-PEPTIDE (PROTEIN) LEVEL source file | $13.84 | $52.00 | $20.81–$292.65 | 73% |
Outpatient: lowest $9.32, median $9.32, highest $9.32.
Cash or insurance?
At the one hospital here that publishes insurer rates for this code, the cash price is below the highest rate a health plan has negotiated and 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 C-peptide test shows how much insulin the pancreas is making. It helps tell type 1 from type 2 diabetes and find the cause of low blood sugar.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.