Magnesium test cost in San Diego, CA — inpatient
In San Diego-Chula Vista-Carlsbad, CA, 10 hospitals list a cash price for magnesium blood test as an inpatient: from $7.93 to $108.05, with a median of $30.37. The lowest listed price is at Grossmont Hospital and 3 other hospitals — $22.44 less than the median here. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 10 facilities across 6 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 May 29, 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 San Diego-Chula Vista-Carlsbad, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Grossmont Hospital lowest La Mesa, CA · (619) 465-0711 HC ASSAY OF MAGNESIUM - MAGNESIUM URINE | $7.93 | $10.58 | $1.59–$10.37 | 25% | — source file |
| Sharp Coronado Hospital and Healthcare Center lowest Coronado, CA · (619) 435-6251 HC ASSAY OF MAGNESIUM - MAGNESIUM URINE | $7.93 | $10.58 | $1.59–$8.46 | 25% | — source file |
| Sharp Memorial Hospital lowest San Diego, CA · (858) 939-3400 HC ASSAY OF MAGNESIUM - MAGNESIUM URINE | $7.93 | $10.58 | $1.48–$8.46 | 25% | — source file |
| Sharp Chula Vista Medical Center lowest Chula Vista, CA · (619) 502-5800 HC ASSAY OF MAGNESIUM - MAGNESIUM URINE | $7.93 | $10.58 | $1.59–$9.52 | 25% | — source file |
| UC San Diego Medical Center San Diego, CA · (619) 543-6222 Magnesium level red blood cells | $17.24 | $31.35 | $3.76–$42.32 | 45% | Apr 1, 2026 source file |
| Sharp Memorial Hospital San Diego, CA · (858) 939-3400 HC ASSAY OF MAGNESIUM - MAGNESIUM RBC | $29.77 | $39.69 | $15.59–$31.75 | 25% | — source file |
| Sharp Chula Vista Medical Center Chula Vista, CA · (619) 502-5800 HC ASSAY OF MAGNESIUM - MAGNESIUM RBC | $29.77 | $39.69 | $5.95–$4,117.35 | 25% | — source file |
| Grossmont Hospital La Mesa, CA · (619) 465-0711 HC ASSAY OF MAGNESIUM - MAGNESIUM RBC | $29.77 | $39.69 | $5.95–$29.77 | 25% | — source file |
| Sharp Coronado Hospital and Healthcare Center Coronado, CA · (619) 435-6251 HC ASSAY OF MAGNESIUM - MAGNESIUM RBC | $29.77 | $39.69 | $11.79–$35.72 | 25% | — source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Scren-Magnesium | $43.50 | $58.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Scrmer Cv-Magnesium | $43.50 | $58.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Scrmer Hc-Magnesium | $43.50 | $58.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Scrlj-Magnesium | $43.50 | $58.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Scripps Nicu-Magnesium | $43.50 | $58.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp Magnesium Serum 301 | $61.50 | $82.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp Magnesium | $61.50 | $82.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp Magnesium, Rand. Urine 301 | $61.50 | $82.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp Magnesium Urine 301 | $61.50 | $82.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rsp Magnesium 301 | $63.00 | $84.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Lab-Bf Magnesium | $103.50 | $138.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Liv-Magnesium | $103.50 | $138.00 | — | 25% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - San Diego - Zion San Diego, CA · (619) 528-5000 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - San Diego - Clairemont Mesa San Diego, CA ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Kaiser Foundation Hospital - San Marcos San Marcos, CA · (760) 528-6295 ASSAY OF MAGNESIUM | $106.08 | $204.00 | $5.00–$15.00 | 48% | — source file |
| Tri-City Medical Center Oceanside, CA · (760) 724-8411 Magnesium Level OB | $108.05 | $180.09 | $126.06–$140.29 | 40% | May 29, 2026 source file |
| Tri-City Medical Center Oceanside, CA · (760) 724-8411 Magnesium Level | $108.05 | $180.09 | $126.06–$140.29 | 40% | May 29, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Lab-Timed Urine Magnesium | $111.00 | $148.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Lab-Urine Magnesium | $111.00 | $148.00 | — | 25% | Apr 1, 2026 source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Lab-Magnesium | $111.00 | $148.00 | — | 25% | Apr 1, 2026 source file |
| UC San Diego Medical Center San Diego, CA · (619) 543-6222 Magnesium Level | $132.55 | $241.00 | $6.70–$325.35 | 45% | Apr 1, 2026 source file |
| Sharp Chula Vista Medical Center Chula Vista, CA · (619) 502-5800 HC MAGNESIUM BLOOD | $139.50 | $186.00 | $55.24–$182.28 | 25% | — source file |
| Grossmont Hospital La Mesa, CA · (619) 465-0711 HC MAGNESIUM BLOOD | $139.50 | $186.00 | $26.04–$182.28 | 25% | — source file |
| Sharp Memorial Hospital San Diego, CA · (858) 939-3400 HC MAGNESIUM BLOOD | $139.50 | $186.00 | $27.90–$148.80 | 25% | — source file |
| Sharp Coronado Hospital and Healthcare Center Coronado, CA · (619) 435-6251 HC MAGNESIUM BLOOD | $139.50 | $186.00 | $27.90–$182.28 | 25% | — source file |
| Rady Children's Hospital - San Diego San Diego, CA · (858) 576-1700 Rch Magnesium Blood | $208.50 | $278.00 | — | 25% | Apr 1, 2026 source file |
Inpatient: lowest $7.93, median $30.37, highest $108.05 — a 13.6× difference within the same market.
As an outpatient, the same code is billed by 11 facilities here, median $17.24 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 6 of 9 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 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.
| Tri-City Medical Center Oceanside, CAMagnesium LC | $2.48 | file |