C-peptide test cost in Washington, DC
In Washington-Arlington-Alexandria, DC-VA-MD-WV, 17 hospitals list a cash price for C-peptide blood test: from $13.00 to $1,140.93, with a median of $163.50. The lowest listed price is at Sentara Northern Virginia Medical Center — $150.50 less than the median here. Across District of Columbia, the median is $154.89 at 4 hospitals.
Cash prices at 17 facilities across 14 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 Apr 1, 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 Washington-Arlington-Alexandria, DC-VA-MD-WV.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Sentara Northern Virginia Medical Center lowest Woodbridge, VA · (703) 523-1000 Chgl (Qu) C-Peptide, S/O File of Apr 1, 2026 · source file | $13.00 | $26.00 | — | 50% |
| MedStar Montgomery Medical Center Olney, MD · (301) 774-8882 C-PEPTIDE File of Apr 1, 2026 · source file | $39.68 | $40.49 | $39.68–$40.49 | 2% |
| MedStar Southern Hospital Center Clinton, MD · (301) 868-8000 C-PEPTIDE File of Apr 1, 2026 · source file | $43.12 | $44.00 | $43.12–$44.00 | 2% |
| National Rehabilitation Hospital Washington, DC C PEPTIDE File of Apr 1, 2026 · source file | $59.16 | $91.01 | $20.39–$77.36 | 35% |
| Jefferson Medical Center Ranson, WV · (304) 728-1600 ASSAY OF C-PEPTIDE source file | $114.00 | $228.00 | — | 50% |
| Sentara Northern Virginia Medical Center Woodbridge, VA · (703) 523-1000 Chgl C Peptide Reactivity File of Apr 1, 2026 · source file | $129.50 | $259.00 | — | 50% |
| Fauquier Health Warrenton, VA · (540) 316-5000 C-peptide source file | $146.80 | $367.00 | $26.16 | 60% |
| Children's National Hospital Washington, DC · (202) 476-5000 C Peptide source file | $149.00 | $298.00 | $20.81–$938.38 | 50% |
| MedStar Washington Hospital Center Washington, DC · (202) 877-7000 C PEPTIDE File of Apr 1, 2026 · source file | $160.77 | $247.34 | $20.81–$217.52 | 35% |
| Inova Fairfax Hospital Falls Church, VA · (703) 698-1110 HC C-PEPTIDE source file | $163.50 | $327.00 | $14.35–$255.06 | 50% |
| Inova Fair Oaks Hospital Fairfax, VA · (703) 391-4170 HC C-PEPTIDE source file | $163.50 | $327.00 | $14.35–$255.06 | 50% |
| Inova Loudoun Hospital Leesburg, VA · (703) 858-6600 HC C-PEPTIDE source file | $163.50 | $327.00 | $14.35–$255.06 | 50% |
| Inova Alexandria Hospital Alexandria, VA · (703) 504-3167 HC C-PEPTIDE source file | $163.50 | $327.00 | $14.35–$255.06 | 50% |
| Inova Mount Vernon Hospital Alexandria, VA · (703) 664-7105 HC C-PEPTIDE source file | $163.50 | $327.00 | $14.35–$255.06 | 50% |
| MedStar Georgetown Hospital Northwest Washington, DC · (202) 784-3000 C PEPTIDE File of Apr 1, 2026 · source file | $205.76 | $316.56 | $20.81–$284.90 | 35% |
| Spotsylvania Regional Medical Center Fredericksburg, VA · (540) 498-4000 C-PEPTIDE+1 more line at this price File of Sep 1, 2026 · source file | $923.40 | $923.40 | $20.81–$831.06 | — |
| Stonesprings Hospital Center Dulles, VA · (571) 349-4000 C-PEPTIDE+1 more line at this price File of Sep 1, 2026 · source file | $1,140.74 | $1,140.74 | $15.98–$809.93 | — |
| Reston Hospital Center Vienna, VA · (703) 689-9000 C-peptide +1 more line at this price File of Sep 1, 2026 · source file | $1,140.93 | $1,140.93 | $20.81–$810.06 | — |
Outpatient: lowest $13.00, median $163.50, highest $1,140.93 — a 87.8× difference within the same market.
As an inpatient, the same code is billed by 10 facilities here, median $163.50. 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 15 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.