Ammonia test cost in Riverside, CA — inpatient
In Riverside-San Bernardino-Ontario, CA, 15 hospitals list a cash price for ammonia blood test as an inpatient: from $16.80 to $513.55, with a median of $187.68. The lowest listed price is at St Mary Medical Center — $170.88 less than the median here. Across California, the median is $180.96 at 203 hospitals.
Cash prices at 15 facilities across 12 cities for code 82140, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Sep 2, 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 Riverside-San Bernardino-Ontario, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| St Mary Medical Center lowest Apple Valley, CA · (760) 242-2311 HC ASSAY OF AMMONIA CDM File of Apr 1, 2026 · source file | $16.80 | $35.00 | — | 52% |
| Palo Verde Hospital Blythe, CA · (760) 922-4115 Ammonia Level File of Jul 1, 2026 · source file | $156.00 | $208.00 | — | 25% |
| St Bernardine Medical Center San Bernardino, CA · (909) 883-8711 AMMONIA File of Feb 28, 2026 · source file | $160.51 | $482.00 | $144.60–$395.24 | 67% |
| Kaiser Ontario Medical Center Campus Ontario, CA · (909) 427-5000 ASSAY OF AMMONIA File of Apr 1, 2026 · source file | $180.96 | $348.00 | $10.00–$30.00 | 48% |
| Kaiser Foundation Hospital - Fontana Fontana, CA · (909) 427-5000 ASSAY OF AMMONIA File of Apr 1, 2026 · source file | $180.96 | $348.00 | $10.00–$30.00 | 48% |
| Kaiser Foundation Hospital - Riverside Riverside, CA · (951) 353-2000 ASSAY OF AMMONIA File of Apr 1, 2026 · source file | $180.96 | $348.00 | $10.00–$30.00 | 48% |
| Kaiser Foundation Hospital - Moreno Valley Moreno Valley, CA · (951) 251-6530 ASSAY OF AMMONIA File of Apr 1, 2026 · source file | $180.96 | $348.00 | $10.00–$30.00 | 48% |
| Community Hospital of San Bernardino San Bernardino, CA · (909) 887-6333 AMMONIA File of Feb 28, 2026 · source file | $187.68 | $480.00 | $288.00–$480.00 | 61% |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC ASSAY OF AMMONIA LAB File of Apr 1, 2026 · source file | $189.60 | $395.00 | — | 52% |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC AMMONIA File of Sep 2, 2026 · source file | $202.05 | $449.00 | $89.80–$381.65 | 55% |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC AMMONIA File of Sep 2, 2026 · source file | $202.05 | $449.00 | $89.80–$404.10 | 55% |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC AMMONIA File of Sep 2, 2026 · source file | $202.05 | $449.00 | $81.27–$336.75 | 55% |
| Victor Valley Global Medical Center Victorville, CA · (760) 245-8691 AMMONIA BLOOD File of May 13, 2026 · source file | $241.00 | $241.00 | $126.52–$241.00 | — |
| Menifee Global Medical Center Menifee, CA · (951) 679-8888 LAB AMMONIA BLOOD File of May 20, 2026 · source file | $301.00 | $301.00 | $158.02–$301.00 | — |
| Hemet Global Medical Center Hemet, CA · (951) 652-2811 LAB AMMONIA BLOOD File of Jun 15, 2026 · source file | $301.00 | $301.00 | $158.02–$301.00 | — |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Assay Blood for Ammonia+1 more line at this price File of Mar 30, 2026 · source file | $513.55 | $513.55 | $10.58–$513.55 | — |
Inpatient: lowest $16.80, median $187.68, highest $513.55 — a 30.6× difference within the same market.
As an outpatient, the same code is billed by 23 facilities here, median $180.96 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 5 of 13 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
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.