Magnesium test cost in Riverside, CA — inpatient
In Riverside-San Bernardino-Ontario, CA, 10 hospitals list a cash price for magnesium blood test as an inpatient: from $7.41 to $134.25, with a median of $12.79. The lowest listed price is at Loma Linda University Behavioral Medicine Center and 3 other hospitals — $5.38 less than the median here. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 10 facilities across 8 cities 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 Sep 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 Riverside-San Bernardino-Ontario, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Loma Linda University Behavioral Medicine Center lowest Redlands, CA HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $4.08–$5.93 | — | Aug 31, 2026 source file |
| Loma Linda University Childrens Hospital lowest Loma Linda, CA · (909) 558-8000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.48–$6.30 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta lowest Murrieta, CA · (951) 290-4000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.34–$5.56 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center lowest Loma Linda, CA · (909) 558-4000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.48–$6.67 | — | Sep 2, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu Magnesium Urine | $8.77 | $8.77 | $4.82–$8.77 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu Magnesium Urine | $8.77 | $8.77 | $4.82–$8.77 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu Magnesium 24hr W/O Cre | $10.53 | $10.53 | $4.82–$10.53 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Qu Magnesium 24hr W/O Cre | $10.53 | $10.53 | $4.82–$10.53 | — | — source file |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC MAGNESIUM QUANT URINE | $16.80 | $35.00 | — | 52% | Apr 1, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $13.77–$20.02 | — | Aug 31, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $5.01–$21.28 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $4.53–$18.77 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $5.01–$22.53 | — | Sep 2, 2026 source file |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC ASSAY OF MAGNESIUM LAB | $32.52 | $67.75 | — | 52% | Apr 1, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC MAGNESIUM | $68.40 | $152.00 | $83.60–$121.60 | 55% | Aug 31, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC MAGNESIUM | $68.40 | $152.00 | $30.40–$129.20 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC MAGNESIUM | $68.40 | $152.00 | $30.40–$136.80 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC MAGNESIUM | $68.40 | $152.00 | $27.51–$114.00 | 55% | Sep 2, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Lab Ref Ab Protozoa Nos (E Histo) | $96.80 | $96.80 | $4.82–$96.80 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Lab Ref Ab Protozoa Nos (E Histo) | $96.80 | $96.80 | $4.82–$96.80 | — | — source file |
| Kaiser Foundation Hospital - Fontana Fontana, CA · (909) 427-5000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Riverside Riverside, CA · (951) 353-2000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Moreno Valley Moreno Valley, CA · (951) 251-6530 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Palo Verde Hospital Blythe, CA · (760) 922-4115 Magnesium Level | $134.25 | $179.00 | — | 25% | Jul 1, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Magnesium | $321.78 | $321.78 | $4.82–$321.78 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Magnesium | $321.78 | $321.78 | $4.82–$321.78 | — | — source file |
Inpatient: lowest $7.41, median $12.79, highest $134.25 — a 18.1× difference within the same market.
As an outpatient, the same code is billed by 15 facilities here, median $8.77 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 0 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 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 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.
| St Mary Medical Center Apple Valley, CAHC ASSAY OF MAGNESIUM CDM | $4.05 | file |