Magnesium test cost in Riverside, CA
In Riverside-San Bernardino-Ontario, CA, 15 hospitals list a cash price for magnesium blood test: from $6.00 to $384.08, with a median of $8.77. The lowest listed price is at Chino Valley Medical Center and 2 other hospitals — $2.77 less than the median here. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 15 facilities across 13 cities for code 83735, 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 17, 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 |
|---|---|---|---|---|---|
| Chino Valley Medical Center lowest Chino, CA · (909) 627-6111 Hc Assay Of Magnesium | $6.00 | $248.35 | $6.37–$248.35 | 98% | Sep 1, 2026 source file |
| Desert Valley Hospital lowest Victorville, CA · (760) 241-8000 MAGNESIUM | $6.00 | $175.00 | $6.63–$175.00 | 97% | Sep 1, 2026 source file |
| Montclair Hospital Medical Center lowest Montclair, CA · (909) 625-8300 Hc Assay Of Magnesium | $6.00 | $248.35 | $6.37–$248.35 | 98% | Sep 1, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.34–$63.22 | — | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.48–$67.34 | — | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $4.08–$6.70 | — | Aug 31, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC SOM MAGNESIUM RANDOM UR | $7.41 | $7.41 | $1.48–$68.72 | — | 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 | $6.70–$20.02 | — | Aug 31, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $4.53–$63.22 | — | 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–$67.34 | — | Sep 2, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC SOM MAGNESIUM, URINE | $25.03 | $25.03 | $5.01–$68.72 | — | 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 Medical Center Loma Linda, CA · (909) 558-4000 HC MAGNESIUM | $68.40 | $152.00 | $5.43–$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 | $6.70–$114.00 | 55% | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC MAGNESIUM | $68.40 | $152.00 | $6.70–$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 | $5.43–$129.20 | 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 - Riverside Riverside, CA · (951) 353-2000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — 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 - 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 |
| San Antonio Regional Hospital Upland, CA · (909) 985-2811 Magnesium level | $185.00 | $418.00 | $5.36–$768.08 | 56% | Apr 2, 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 |
| Hospital of Barstow Barstow, CA · (760) 256-1761 Magnesium level | $384.08 | $640.13 | $7.69–$512.10 | 40% | Sep 17, 2026 source file |
Outpatient: lowest $6.00, median $8.77, highest $384.08 — a 64.0× difference within the same market.
As an inpatient, the same code is billed by 10 facilities here, median $12.79. 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 8 of 13 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 3 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 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 |