C-peptide test cost in Milwaukee, WI
In Milwaukee-Waukesha, WI, 18 hospitals list a cash price for C-peptide blood test: from $43.46 to $240.09, with a median of $87.50. The lowest listed price is at Ascension Columbia St. Mary's Hospital - Milwaukee Campus and 2 other hospitals — $44.04 less than the median here. Across Wisconsin, the median is $87.50 at 96 hospitals.
Cash prices at 18 facilities across 11 cities for code 84681, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Nov 21, 2025 and Mar 23, 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 Milwaukee-Waukesha, WI.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Ascension Columbia St. Mary's Hospital - Milwaukee Campus lowest Milwaukee, WI · (414) 585-1374 HC ASSAY OF C-PEPTIDE+1 more line at this price source file | $43.46 | $82.00 | $12.36–$80.43 | 47% |
| Ascension Sacred Heart Rehabilitation Hospital lowest Mequon, WI HC ASSAY OF C-PEPTIDE+1 more line at this price source file | $43.46 | $82.00 | $12.36–$80.43 | 47% |
| Ascension Columbia St. Mary's Hospital - Ozaukee Campus lowest Mequon, WI HC ASSAY OF C-PEPTIDE+1 more line at this price source file | $43.46 | $82.00 | $12.36–$80.43 | 47% |
| Ascension SE Wisconsin Hospital - Franklin Campus Franklin, WI · (414) 447-2130 HC ASSAY OF C-PEPTIDE source file | $54.59 | $103.00 | $8.64–$93.25 | 47% |
| Ascension SE Wisconsin Hospital Milwaukee, WI · (414) 447-2130 HC ASSAY OF C-PEPTIDE source file | $54.59 | $103.00 | $8.64–$93.25 | 47% |
| Ascension St. Francis Hospital Milwaukee, WI · (414) 647-5000 HC ASSAY OF C-PEPTIDE source file | $54.59 | $103.00 | $8.64–$93.25 | 47% |
| Midwest Orthopedic Specialty Hospital Franklin, WI HC ASSAY OF C-PEPTIDE source file | $54.59 | $103.00 | $8.64–$93.25 | 47% |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora St Lukes Medical Center Milwaukee, WI · (414) 649-6000 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora St. Luke's South Shore of Aurora Health Care Metro Cudahy, WI · (414) 649-6000 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Aurora Psychiatric Hospital Wauwatosa, WI · (414) 454-6600 C-PEPTIDE File of Nov 21, 2025 · source file | $87.50 | $175.00 | $15.41–$148.75 | 50% |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC C PEPTIDE BLOOD+1 more line at this price File of Mar 23, 2026 · source file | $240.08 | $436.50 | $305.55–$414.68 | 45% |
| Orthopaedic Hospital of Wisconsin Glendale, WI C-PEPTIDE source file | $240.09 | $453.00 | $7.37–$37.28 | 47% |
Outpatient: lowest $43.46, median $87.50, highest $240.09 — a 5.5× difference within the same market.
As an inpatient, the same code is billed by 14 facilities here, median $87.50. 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 17 of 18 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 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.