Magnesium test cost in Nashville, TN — inpatient
In Nashville-Davidson--Murfreesboro--Franklin, TN, 4 hospitals list a cash price for magnesium blood test as an inpatient: from $5.64 to $14.04, with a median of $6.59. The lowest listed price is at Saint Thomas West Hospital and 1 other hospital — $0.95 less than the median here. Across Tennessee, the median is $11.85 at 44 hospitals.
Cash prices at 4 facilities across 4 cities for code 83735, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Oct 1, 2025 and Oct 1, 2025.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Nashville-Davidson--Murfreesboro--Franklin, TN.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Saint Thomas West Hospital lowest Harding Pk Nashville, TN · (615) 222-2111 MAGNESIUM RBC | $5.64 | $18.80 | $6.03–$17.82 | 70% | — source file |
| Saint Thomas Rutherford Hospital lowest Murfreesboro, TN · (615) 396-4100 MAGNESIUM RBC | $5.64 | $18.80 | $6.03–$18.74 | 70% | — source file |
| Vanderbilt Wilson County Hospital Lebanon, TN · (615) 444-2250 HC UR 24HR KIDNEY STONE PNL MAGNESIUM - (LTH) | $7.54 | $26.00 | $6.35–$23.99 | 71% | Oct 1, 2025 source file |
| Vanderbilt University Medical Center Nashville, TN · (615) 322-3454 HC UR 24HR KIDNEY STONE PNL MAGNESIUM - (LTH) | $14.04 | $26.00 | $6.35–$23.99 | 46% | Oct 1, 2025 source file |
| Vanderbilt Wilson County Hospital Lebanon, TN · (615) 444-2250 HC MAGNESIUM BLOOD | $24.65 | $85.00 | $6.35–$68.00 | 71% | Oct 1, 2025 source file |
| Saint Thomas Rutherford Hospital Murfreesboro, TN · (615) 396-4100 MAGNESIUM | $25.76 | $85.85 | $6.03–$25.96 | 70% | — source file |
| Saint Thomas West Hospital Harding Pk Nashville, TN · (615) 222-2111 MAGNESIUM | $25.76 | $85.85 | $6.03–$25.96 | 70% | — source file |
| Saint Thomas Rutherford Hospital Murfreesboro, TN · (615) 396-4100 MAGNESIUM RANDUM URINE | $26.96 | $89.85 | $6.03–$25.96 | 70% | — source file |
| Vanderbilt University Medical Center Nashville, TN · (615) 322-3454 HC MAGNESIUM BLOOD | $45.90 | $85.00 | $6.35–$68.00 | 46% | Oct 1, 2025 source file |
| Saint Thomas West Hospital Harding Pk Nashville, TN · (615) 222-2111 MAGNESIUM 24 HR URINE | $73.44 | $244.80 | $6.03–$25.96 | 70% | — source file |
| Saint Thomas Rutherford Hospital Murfreesboro, TN · (615) 396-4100 MAGNESIUM 24 HR URINE | $73.44 | $244.80 | $6.03–$25.96 | 70% | — source file |
Inpatient: lowest $5.64, median $6.59, highest $14.04 — a 2.5× difference within the same market.
As an outpatient, the same code is billed by 4 facilities here, median $6.59 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 4 of 4 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.