Phosphorus test cost in Stockton, CA
In Stockton-Lodi, CA, 4 hospitals list a cash price for phosphorus (phosphate) blood test: from $75.60 to $241.36, with a median of $141.12. The lowest listed price is at Kaiser Foundation Hospital - Manteca — $65.52 less than the median here. Across California, the median is $75.60 at 194 hospitals.
Cash prices at 4 facilities across 3 cities for code 84100, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Apr 2, 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 Stockton-Lodi, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Kaiser Foundation Hospital - Manteca lowest Manteca, CA · (209) 825-3700 ASSAY OF PHOSPHORUS INORGANIC source file | $75.60 | $135.00 | $5.00–$15.00 | 44% |
| St Joseph's Medical Center of Stockton Stockton, CA · (209) 943-2000 PHOSPHORUS File of Feb 28, 2026 · source file | $140.24 | $477.00 | $4.03–$391.14 | 71% |
| Sutter Tracy Community Hospital Tracy, CA · (209) 835-1500 HCHG PHOSPHORUS (PO4) File of Apr 1, 2026 · source file | $142.00 | $142.00 | — | — |
| Dameron Hospital Stockton, CA · (209) 944-5550 Phosphate level File of Apr 2, 2026 · source file | $241.36 | $536.36 | $3.79–$535.82 | 55% |
Outpatient: lowest $75.60, median $141.12, highest $241.36 — a 3.2× difference within the same market.
As an inpatient, the same code is billed by 3 facilities here, median $140.24. 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 2 of 3 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 phosphorus test measures phosphate in the blood. It is used with calcium for kidney disease, bone disease and parathyroid problems.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
2 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84100 ($41.60). 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.
| Hospital | Cash price | File |
|---|---|---|
| St Joseph's Medical Center of Stockton Stockton, CARL-A-PHOS 20028 | $1.91 | file |
| St. Joseph's Behavioral Health Center Stockton, CARL-A-PHOS 20028 | $3.70 | file |