Magnesium test cost in Los Angeles, CA — inpatient
In Los Angeles-Long Beach-Anaheim, CA, 28 hospitals list a cash price for magnesium blood test as an inpatient: from $5.74 to $210.80, with a median of $106.08. The lowest listed price is at Hoag Memorial Hospital Presbyterian — $100.34 less than the median here. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 28 facilities across 19 cities for code 83735, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Nov 26, 2025 and Apr 1, 2026.
Lowest$5.74Hoag Memorial Hospital Presbyterian
Median$106.08half pay less
Highest$210.80in this market
Difference36.7×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Los Angeles-Long Beach-Anaheim, CA.
median
Lowest $5.74Highest $262.00
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Hoag Memorial Hospital Presbyterian lowest Newport Beach, CA · (949) 764-4624 HC Assay of Magnesium # | $5.74 | $8.83 | — | 35% | Apr 1, 2026 source file |
| UCI Health-Orange Orange, CA · (714) 456-7890 HB LAB ARUP RBC MAGNESIUM | $12.54 | $31.35 | — | 60% | Apr 1, 2026 source file |
| Cedars-Sinai Medical Center Los Angeles, CA · (310) 423-5000 HB MISC LAB SPECIAL TEST | $16.45 | $25.31 | $13,270.00–$14,761.00 | 35% | Nov 26, 2025 source file |
| Cedars-Sinai Medical Center Los Angeles, CA · (310) 423-5000 HB LAB MAGNESIUM SE ER | $16.45 | $25.31 | $13,270.00–$14,761.00 | 35% | Nov 26, 2025 source file |
| St Joseph Hospital of Orange Orange, CA · (714) 633-9111 HC MAGNESIUM QUANT URINE | $16.80 | $35.00 | — | 52% | Apr 1, 2026 source file |
| Mission Hospital Regional Med Center Mission Viejo, CA · (949) 364-1400 HC MAGNESIUM QUANT URINE | $16.80 | $35.00 | — | 52% | Apr 1, 2026 source file |
| St Jude Hospital Fullerton, CA · (714) 992-3000 HC MAGNESIUM QUANT URINE | $16.80 | $35.00 | — | 52% | Apr 1, 2026 source file |
| UCI Health-Orange Orange, CA · (714) 456-7890 HB ASSAY OF MAGNESIUM | $21.20 | $53.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Fountain Valley Orange, CA · (714) 456-7890 MAGNESIUM | $21.20 | $53.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Placentia Linda Orange, CA · (714) 456-7890 MAGNESIUM | $21.20 | $53.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Los Alamitos Orange, CA · (714) 456-7890 MAGNESIUM | $21.20 | $53.00 | — | 60% | Apr 1, 2026 source file |
| St Jude Hospital Fullerton, CA · (714) 992-3000 HC ASSAY OF MAGNESIUM LAB | $32.52 | $67.75 | — | 52% | Apr 1, 2026 source file |
| Mission Hospital Regional Med Center Mission Viejo, CA · (949) 364-1400 HC ASSAY OF MAGNESIUM LAB | $32.52 | $67.75 | — | 52% | Apr 1, 2026 source file |
| St Joseph Hospital of Orange Orange, CA · (714) 633-9111 HC ASSAY OF MAGNESIUM LAB | $32.52 | $67.75 | — | 52% | Apr 1, 2026 source file |
| Hoag Memorial Hospital Presbyterian Newport Beach, CA · (949) 764-4624 HC Magnesium | $57.36 | $88.25 | — | 35% | Apr 1, 2026 source file |
| Providence Saint Joseph Medical Center Burbank, CA · (818) 843-5111 HC ASSAY OF MAGNESIUM LAB | $57.75 | $165.00 | — | 65% | Apr 1, 2026 source file |
| Providence Saint Joseph Medical Center Burbank, CA · (818) 843-5111 HC MAGNESIUM 24HR URINE | $57.75 | $165.00 | — | 65% | Apr 1, 2026 source file |
| Providence Saint Joseph Medical Center Burbank, CA · (818) 843-5111 HC MAGNESIUM-URINE | $57.75 | $165.00 | — | 65% | Apr 1, 2026 source file |
| Providence Saint Joseph Medical Center Burbank, CA · (818) 843-5111 HC ASSAY OF MAGNESIUM | $57.75 | $165.00 | — | 65% | Apr 1, 2026 source file |
| Providence Saint Joseph Medical Center Burbank, CA · (818) 843-5111 HC ASSAY OF MAGNESIUM CDM | $57.75 | $165.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Company of Mary Medical Center Torrance Torrance, CA · (310) 540-7676 HC ASSAY OF MAGNESIUM | $80.50 | $230.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Company of Mary Medical Center Torrance Torrance, CA · (310) 540-7676 HC ASSAY OF MAGNESIUM CDM | $80.50 | $230.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Co of Mary Medical Center San Pedro San Pedro, CA · (310) 832-3311 HC ASSAY OF MAGNESIUM | $80.50 | $230.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Co of Mary Medical Center San Pedro San Pedro, CA · (310) 832-3311 HC ASSAY OF MAGNESIUM CDM | $80.50 | $230.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Co of Mary Medical Center San Pedro San Pedro, CA · (310) 832-3311 HC MAGNESIUM-URINE | $96.60 | $276.00 | — | 65% | Apr 1, 2026 source file |
| Providence Little Company of Mary Medical Center Torrance Torrance, CA · (310) 540-7676 HC MAGNESIUM-URINE | $96.60 | $276.00 | — | 65% | Apr 1, 2026 source file |
| Providence Cedars Sinai Tarzana Medical Center Tarzana, CA · (818) 881-0800 HC ASSAY OF MAGNESIUM | $103.25 | $295.00 | — | 65% | Apr 1, 2026 source file |
| Providence Cedars Sinai Tarzana Medical Center Tarzana, CA · (818) 881-0800 HC MAGNESIUM QUANT URINE | $103.25 | $295.00 | — | 65% | Apr 1, 2026 source file |
| Providence Cedars Sinai Tarzana Medical Center Tarzana, CA · (818) 881-0800 HC ASSAY OF MAGNESIUM CDM | $103.25 | $295.00 | — | 65% | Apr 1, 2026 source file |
| Providence Cedars Sinai Tarzana Medical Center Tarzana, CA · (818) 881-0800 HC MAGNESIUM-URINE | $103.25 | $295.00 | — | 65% | Apr 1, 2026 source file |
| Providence Cedars Sinai Tarzana Medical Center Tarzana, CA · (818) 881-0800 HC MAGNESIUM 24HR URINE | $103.25 | $295.00 | — | 65% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - Orange County - Anaheim Anaheim, CA · (714) 279-4000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - West la Los Angeles, CA · (213) 857-2201 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Woodland Hills Woodland Hills, CA · (818) 719-3800 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Orange County - Irvine Irvine, CA ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Baldwin Park Baldwin Park, CA · (626) 851-1011 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Panorama City Panorama City, CA · (818) 375-2000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Downey Downey, CA · (562) 461-6007 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - South Bay Harbor City, CA · (310) 325-5111 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - Los Angeles Los Angeles, CA · (323) 783-4011 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Saint John's Health Center Santa Monica, CA · (310) 829-5511 HC MAGNESIUM QUANT URINE | $113.05 | $323.00 | — | 65% | Apr 1, 2026 source file |
| Cedars-Sinai Marina Hospital Marina del Rey, CA · (310) 823-8911 HB LAB MAGNESIUM SE ER | $121.68 | $187.21 | $7,175.00–$9,712.00 | 35% | Nov 26, 2025 source file |
| Cedars-Sinai Marina Hospital Marina del Rey, CA · (310) 823-8911 HB MAGNESIUM RBC | $121.68 | $187.21 | $7,175.00–$9,712.00 | 35% | Nov 26, 2025 source file |
| Saint John's Health Center Santa Monica, CA · (310) 829-5511 HC ASSAY OF MAGNESIUM CDM | $123.55 | $353.00 | — | 65% | Apr 1, 2026 source file |
| Providence Holy Cross Medical Center Mission Hills, CA · (818) 365-8051 HC ASSAY OF MAGNESIUM | $148.40 | $424.00 | — | 65% | Apr 1, 2026 source file |
| Providence Holy Cross Medical Center Mission Hills, CA · (818) 365-8051 HC ASSAY OF MAGNESIUM CDM | $148.40 | $424.00 | — | 65% | Apr 1, 2026 source file |
| Providence Holy Cross Medical Center Mission Hills, CA · (818) 365-8051 HC MAGNESIUM-URINE | $166.25 | $475.00 | — | 65% | Apr 1, 2026 source file |
| Keck Hospital of USC Los Angeles, CA · (323) 442-8656 Assay Of Magnesium | $171.00 | $171.00 | — | — | Apr 1, 2026 source file |
| USC Kenneth Norris Jr Cancer Hospital Los Angeles, CA Assay Of Magnesium | $206.25 | $206.25 | — | — | Apr 1, 2026 source file |
| UCI Health - Lakewood Orange, CA · (714) 456-7890 MAGNESIUM/4 | $210.80 | $527.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Lakewood Orange, CA · (714) 456-7890 MAGNESIUM/5 | $228.40 | $571.00 | — | 60% | Apr 1, 2026 source file |
| Providence Holy Cross Medical Center Mission Hills, CA · (818) 365-8051 HC MAGNESIUM 24HR URINE | $237.65 | $679.00 | — | 65% | Apr 1, 2026 source file |
| Providence Holy Cross Medical Center Mission Hills, CA · (818) 365-8051 HC MAGNESIUM QUANT URINE | $237.65 | $679.00 | — | 65% | Apr 1, 2026 source file |
| UCI Health - Lakewood Orange, CA · (714) 456-7890 MAGNESIUM | $262.00 | $655.00 | — | 60% | Apr 1, 2026 source file |
Inpatient: lowest $5.74, median $106.08, highest $210.80 — a 36.7× difference within the same market.
As an outpatient, the same code is billed by 31 facilities here, median $50.40 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 11 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 2 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.
6 rows held back from this comparison
They are 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.
| UCI Health - Los Alamitos Orange, CAMAGNESIUM/4 | $1.30 | file |
| Hoag Memorial Hospital Presbyterian Newport Beach, CAHC Magnesium Random Urine | $2.25 | file |
| Hoag Memorial Hospital Presbyterian Newport Beach, CAHC Magnesium Quant Urine | $3.98 | file |
| Mission Hospital Regional Med Center Mission Viejo, CAHC ASSAY OF MAGNESIUM CDM | $4.05 | file |
| St Jude Hospital Fullerton, CAHC ASSAY OF MAGNESIUM CDM | $4.05 | file |
| St Joseph Hospital of Orange Orange, CAHC ASSAY OF MAGNESIUM CDM | $4.05 | file |