C-peptide test cost in Boston, MA
In Boston-Cambridge-Newton, MA-NH, 26 hospitals list a cash price for C-peptide blood test: from $30.60 to $917.00, with a median of $130.00. The lowest listed price is at Boston Medical Center — $99.40 less than the median here. Across Massachusetts, the median is $117.34 at 33 hospitals.
Cash prices at 26 facilities across 19 cities for code 84681, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Jan 28, 2026 and Sep 1, 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 Boston-Cambridge-Newton, MA-NH.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Boston Medical Center lowest Boston, MA · (617) 638-8000 HC Chg Assay of C-Peptide source file | $30.60 | $68.00 | $18.00–$512.54 | 55% |
| Boston Medical Center South Brockton, MA · (508) 427-3000 HC Chg Assay of C-Peptide source file | $34.91 | $77.58 | $18.35–$394.86 | 55% |
| Boston Medical Center Brighton Boston, MA · (617) 789-3000 HC Chg Assay of C-Peptide source file | $39.71 | $88.24 | $18.35–$475.07 | 55% |
| Melrosewakefield Healthcare Melrose, MA · (781) 979-3000 HC Assay of C-Peptide - C-Peptide source file | $51.10 | $73.00 | $25.55–$530.75 | 30% |
| Tufts Medical Center Boston, MA · (617) 636-5000 HC Assay of C-Peptide - C-Peptide source file | $51.10 | $73.00 | $19.17–$90.32 | 30% |
| Lowell General Hospital Lowell, MA · (978) 937-6000 HC Assay of C-Peptide - C-Peptide source file | $51.10 | $73.00 | $25.55–$85.48 | 30% |
| Signature Healthcare Brockton Hospital Brockton, MA · (508) 941-7000 C-PEPTIDE File of Jan 28, 2026 · source file | $60.20 | $86.00 | $20.39–$66.70 | 30% |
| Cambridge Health Alliance Cambridge, MA · (617) 665-1000 HC C-Peptide So source file | $65.00 | $65.00 | $18.35–$143.59 | — |
| Emerson Hospital Concord, MA · (978) 369-1400 ASSAY OF C-PEPTIDE File of May 18, 2026 · source file | $66.75 | $89.00 | $19.75–$89.00 | 25% |
| Winchester Hospital Winchester, MA · (781) 729-9000 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $102.00 | $102.00 | — | — |
| Beth Israel Deaconess Hospital-Milton Milton, MA · (617) 696-4600 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $123.00 | $123.00 | — | — |
| Southcoast Hospitals Group - Tobey Hospital Campus Wareham, MA · (508) 679-3131 HC Assay of C-Peptide source file | $124.00 | $248.00 | $20.81–$188.73 | 50% |
| Beth Israel Deaconess Medical Center Boston, MA · (617) 667-7000 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $126.00 | $126.00 | — | — |
| Beth Israel Deaconess Hospital - Plymouth Plymouth, MA · (508) 746-2000 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $134.00 | $134.00 | — | — |
| Lahey Hospital & Medical Center, Burlington Burlington, MA · (781) 744-5100 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $137.00 | $137.00 | — | — |
| Beth Israel Deaconess Hospital - Needham Needham, MA · (781) 453-3002 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $153.00 | $153.00 | — | — |
| Shriners Childrens - Boston Boston, MA · (617) 722-3000 ASSAY OF C-PEPTIDE source file | $170.30 | $170.30 | $18.00–$817.41 | — |
| New England Baptist Hospital Boston, MA · (617) 754-5800 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $177.00 | $177.00 | — | — |
| Mount Auburn Hospital Cambridge, MA · (617) 492-3500 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $209.00 | $209.00 | — | — |
| Anna Jaques Hospital Newburyport, MA · (978) 463-1000 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $236.00 | $236.00 | — | — |
| Dover Emergency Room Dover, NH · (603) 436-5110 C-peptide +1 more line at this price File of Sep 1, 2026 · source file | $272.00 | $272.00 | $35.88–$258.40 | — |
| Portsmouth Regional Hospital Portsmouth, NH · (603) 436-5110 C-PEPTIDE+1 more line at this price File of Sep 1, 2026 · source file | $272.00 | $272.00 | $35.88–$258.40 | — |
| Seabrook Emergency Seabrook, NH · (603) 436-5110 C-peptide +1 more line at this price File of Sep 1, 2026 · source file | $272.00 | $272.00 | $35.88–$258.40 | — |
| Exeter Hospital Exeter, NH · (603) 778-7311 CHG ASSAY OF C-PEPTIDE File of Apr 1, 2026 · source file | $451.00 | $451.00 | — | — |
| Parkland Medical Center Derry, NH · (603) 421-2100 C-PEPTIDE+1 more line at this price File of Sep 1, 2026 · source file | $917.00 | $917.00 | $34.23–$871.15 | — |
| Plaistow Fser Plaistow, NH · (603) 421-2100 C-peptide +1 more line at this price File of Sep 1, 2026 · source file | $917.00 | $917.00 | $34.23–$871.15 | — |
Outpatient: lowest $30.60, median $130.00, highest $917.00 — a 30.0× difference within the same market.
As an inpatient, the same code is billed by 20 facilities here, median $112.50. 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 11 of 16 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
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.