C-peptide test cost in San Diego, CA
In San Diego-Chula Vista-Carlsbad, CA, 9 hospitals list a cash price for C-peptide blood test: from $10.50 to $121.16, with a median of $32.25. The lowest listed price is at Rady Children's Hospital - San Diego — $21.75 less than the median here. Across California, the median is $63.84 at 144 hospitals.
Cash prices at 9 facilities across 6 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 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 San Diego-Chula Vista-Carlsbad, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Rady Children's Hospital - San Diego lowest San Diego, CA · (858) 576-1700 Pph 17-Hydroxyprogesterone Lc/Ms/Ms | $10.50 | $14.00 | — | 25% | Apr 1, 2026 source file |
| Paradise Valley Hospital National City, CA · (619) 470-4321 C-PEPTIDE | $20.00 | $120.18 | $20.46–$120.18 | 83% | Sep 1, 2026 source file |
| Sharp Memorial Hospital San Diego, CA · (858) 939-3400 HC ASSAY OF C-PEPTIDE - C-PEPTIDE | $32.25 | $43.00 | $1.00–$683.93 | 25% | — source file |
| Sharp Chula Vista Medical Center Chula Vista, CA · (619) 502-5800 HC ASSAY OF C-PEPTIDE - C-PEPTIDE | $32.25 | $43.00 | $1.15–$65.96 | 25% | — source file |
| Grossmont Hospital La Mesa, CA · (619) 465-0711 HC ASSAY OF C-PEPTIDE - C-PEPTIDE | $32.25 | $43.00 | $1.00–$1,737.63 | 25% | — source file |
| Sharp Coronado Hospital and Healthcare Center Coronado, CA · (619) 435-6251 HC ASSAY OF C-PEPTIDE - C-PEPTIDE | $32.25 | $43.00 | $1.15–$42.14 | 25% | — source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch C Peptide | $37.50 | $50.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp C-Peptide | $37.50 | $50.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Lab-C-Peptide | $61.50 | $82.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Scripps Nicu-Hc C-Peptide | $120.00 | $160.00 | — | 25% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - San Diego - Clairemont Mesa San Diego, CA · (619) 528-5000 ASSAY OF C-PEPTIDE | $121.16 | $233.00 | $15.00–$45.00 | 48% | — source file |
| Kaiser Foundation Hospital - San Diego - Zion San Diego, CA · (619) 528-5000 ASSAY OF C-PEPTIDE | $121.16 | $233.00 | $15.00–$45.00 | 48% | — source file |
| Kaiser Foundation Hospital - San Marcos San Marcos, CA · (760) 528-6295 ASSAY OF C-PEPTIDE | $121.16 | $233.00 | $15.00–$45.00 | 48% | — source file |
Outpatient: lowest $10.50, median $32.25, highest $121.16 — a 11.5× difference within the same market.
As an inpatient, the same code is billed by 8 facilities here, median $32.25. 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 5 of 8 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.
4 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84681 ($93.00). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.
| UC San Diego Medical Center San Diego, CAC-peptide (protein) level | $5.56 | file |
| Palomar Medical Center Escondido Escondido, CAC-Peptide | $7.31 | file |
| Palomar Medical Center Poway Poway, CAC-Peptide | $7.31 | file |
| Rady Children's Hospital - San Diego San Diego, CAPph C-Peptide (Q372) | $7.95 | file |