Magnesium test cost in Helena, MT — inpatient
In Helena, MT, 1 hospital lists a cash price for magnesium blood test as an inpatient: from $31.03 to $31.03, with a median of $31.03. Across Montana, the median is $52.80 at 8 hospitals.
Cash prices at 1 facility for code 83735, as an inpatient (admitted to hospital) . Collected Sep 22, 2026; the hospital files themselves were last updated between — and —.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| St. Peter's Health Helena, MT · (406) 442-2480 HC MAGNESIUM, BLOOD | $31.03 | $36.50 | $34.68 | 15% | — source file |
Inpatient: lowest $31.03, median $31.03, highest $31.03.
As an outpatient, the same code is billed by 1 facility here, median $26.95 — that is the price to compare if you are not being admitted.
Cash or insurance?
At the one hospital here that publishes insurer rates for this code, the cash price is below the highest rate a health plan has negotiated and 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.