C-peptide test cost in Charleston, IL
In Charleston-Mattoon, IL, 1 hospital lists a cash price for C-peptide blood test: from $130.00 to $130.00, with a median of $130.00. 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 27, 2026; the hospital files themselves were last updated between Jun 3, 2026 and Jun 3, 2026.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Sarah Bush Lincoln Health Center Mattoon, IL · (217) 258-2513 C-peptide (protein) level | $130.00 | $130.00 | $12.17–$119.60 | — | Jun 3, 2026 source file |
Outpatient: lowest $130.00, median $130.00, highest $130.00.
Cash or insurance?
At the one hospital here that publishes insurer rates for this code, the cash price is not below the highest rate a health plan has negotiated. 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.