Magnesium test cost in Napa, CA — inpatient
In Napa, CA, 1 hospital lists a cash price for magnesium blood test as an inpatient: from $17.85 to $17.85, with a median of $17.85. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 1 facility for code 83735, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Apr 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 Napa, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Providence Queen of the Valley Medical Center lowest Napa, CA · (707) 252-4411 HC MAGNESIUM QUANT URINE | $17.85 | $35.00 | — | 49% | Apr 1, 2026 source file |
| Providence Queen of the Valley Medical Center Napa, CA · (707) 252-4411 HC ASSAY OF MAGNESIUM LAB | $34.55 | $67.75 | — | 49% | Apr 1, 2026 source file |
Inpatient: lowest $17.85, median $17.85, highest $17.85.
As an outpatient, the same code is billed by 1 facility here, median $17.85 — that is the price to compare if you are not being admitted.
What it is
A magnesium test measures the level of magnesium in the blood. Doctors order it for muscle cramps or weakness, an irregular heartbeat, low potassium or calcium that does not correct, and for people on diuretics, long-term acid-reducing drugs or with kidney disease.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 83735 ($43.50). 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.
| Providence Queen of the Valley Medical Center Napa, CAHC ASSAY OF MAGNESIUM CDM | $4.30 | file |