Ammonia test cost in Modesto, CA
In Modesto, CA, 2 hospitals list a cash price for ammonia blood test: from $222.88 to $387.00, with a median of $304.94. The lowest listed price is at Kaiser Foundation Hospital - Modesto — $82.06 less than the median here. Across California, the median is $180.96 at 206 hospitals.
Cash prices at 2 facilities for code 82140, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Apr 1, 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 Modesto, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Kaiser Foundation Hospital - Modesto lowest Modesto, CA ASSAY OF AMMONIA | $222.88 | $398.00 | $13.00–$40.00 | 44% | — source file |
| Memorial Medical Center Modesto, CA · (209) 526-4500 HCHG CORE AMMONIA | $387.00 | $387.00 | — | — | Apr 1, 2026 source file |
| Memorial Medical Center Modesto, CA · (209) 526-4500 HCHG AMMONIA | $387.00 | $387.00 | — | — | Apr 1, 2026 source file |
Outpatient: lowest $222.88, median $304.94, highest $387.00 — a 1.7× difference within the same market.
As an inpatient, the same code is billed by 2 facilities here, median $304.94. 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 the one hospital here that publishes insurer rates for this code, the cash price is not below the highest rate a health plan has negotiated. 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
An ammonia test measures ammonia in the blood. It is used for confusion or drowsiness in people with liver disease and for some rare inherited disorders in newborns.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.