Ammonia test cost in Riverside, CA
In Riverside-San Bernardino-Ontario, CA, 23 hospitals list a cash price for ammonia blood test: from $10.64 to $1,272.50, with a median of $180.96. The lowest listed price is at Mountains Community Hospital — $170.32 less than the median here. Across California, the median is $180.96 at 206 hospitals.
Cash prices at 23 facilities across 18 cities 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 Feb 28, 2026 and Sep 17, 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 | File date |
|---|---|---|---|---|---|
| Mountains Community Hospital lowest Lake Arrowhead, CA · (909) 336-3651 AMMONIA | $10.64 | $26.59 | $11.97–$22.60 | 60% | — source file |
| Chino Valley Medical Center Chino, CA · (909) 627-6111 Hc Assay Of Ammonia | $14.00 | $399.09 | $13.84–$399.09 | 96% | Sep 1, 2026 source file |
| Desert Valley Hospital Victorville, CA · (760) 241-8000 AMMONIA | $14.00 | $290.25 | $14.42–$290.25 | 95% | Sep 1, 2026 source file |
| Montclair Hospital Medical Center Montclair, CA · (909) 625-8300 Hc Assay Of Ammonia | $14.00 | $399.09 | $13.84–$399.09 | 96% | Sep 1, 2026 source file |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC ASSAY OF AMMONIA CDM | $16.80 | $35.00 | — | 52% | Apr 1, 2026 source file |
| San Gorgonio Memorial Hospital Banning, CA · (951) 769-2101 AMMONIA LEVEL | $21.89 | $109.46 | $13.84–$109.46 | 80% | — source file |
| St Bernardine Medical Center San Bernardino, CA · (909) 883-8711 AMMONIA | $36.97 | $111.00 | $12.53–$111.00 | 67% | Feb 28, 2026 source file |
| Mountains Community Hospital Lake Arrowhead, CA · (909) 336-3651 AMMONIA LEVEL | $43.60 | $109.00 | $49.05–$92.65 | 60% | — source file |
| Community Hospital of San Bernardino San Bernardino, CA · (909) 887-6333 AMMONIA | $52.40 | $134.00 | $14.57–$134.00 | 61% | Feb 28, 2026 source file |
| San Gorgonio Memorial Hospital Banning, CA · (951) 769-2101 ASSAY OF AMMONIA | $63.84 | $319.20 | $13.84–$319.20 | 80% | — source file |
| Palo Verde Hospital Blythe, CA · (760) 922-4115 Ammonia Level | $156.00 | $208.00 | — | 25% | Jul 1, 2026 source file |
| Kaiser Foundation Hospital - Riverside Riverside, CA · (951) 353-2000 ASSAY OF AMMONIA | $180.96 | $348.00 | $10.00–$30.00 | 48% | — source file |
| Kaiser Foundation Hospital - Moreno Valley Moreno Valley, CA · (951) 251-6530 ASSAY OF AMMONIA | $180.96 | $348.00 | $10.00–$30.00 | 48% | — source file |
| Kaiser Foundation Hospital - Fontana Fontana, CA · (909) 427-5000 ASSAY OF AMMONIA | $180.96 | $348.00 | $10.00–$30.00 | 48% | — source file |
| San Antonio Regional Hospital Upland, CA · (909) 985-2811 Ammonia level | $185.00 | $910.00 | $11.66–$1,672.13 | 80% | Apr 2, 2026 source file |
| St Mary Medical Center Apple Valley, CA · (760) 242-2311 HC ASSAY OF AMMONIA LAB | $189.60 | $395.00 | — | 52% | Apr 1, 2026 source file |
| Loma Linda University Childrens Hospital Loma Linda, CA · (909) 558-8000 HC AMMONIA | $202.05 | $449.00 | $11.80–$381.65 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center - Murrieta Murrieta, CA · (951) 290-4000 HC AMMONIA | $202.05 | $449.00 | $14.57–$336.75 | 55% | Sep 2, 2026 source file |
| Loma Linda University Medical Center Loma Linda, CA · (909) 558-4000 HC AMMONIA | $202.05 | $449.00 | $11.80–$404.10 | 55% | Sep 2, 2026 source file |
| Loma Linda University Behavioral Medicine Center Redlands, CA HC AMMONIA | $202.05 | $449.00 | $14.57–$359.20 | 55% | Aug 31, 2026 source file |
| Victor Valley Global Medical Center Victorville, CA · (760) 245-8691 AMMONIA BLOOD | $241.00 | $241.00 | $8.92–$241.00 | — | May 13, 2026 source file |
| Hemet Global Medical Center Hemet, CA · (951) 652-2811 LAB AMMONIA BLOOD | $301.00 | $301.00 | $12.95–$301.00 | — | Jun 15, 2026 source file |
| Menifee Global Medical Center Menifee, CA · (951) 679-8888 LAB AMMONIA BLOOD | $301.00 | $301.00 | $12.95–$301.00 | — | May 20, 2026 source file |
| Barstow Community Hospital Barstow, CA · (760) 256-1761 Ammonia level | $417.73 | $696.21 | $16.71–$556.97 | 40% | Sep 17, 2026 source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Assay Blood for Ammonia | $513.55 | $513.55 | $10.58–$513.55 | — | — source file |
| Riverside University Medical Center Moreno Valley, CA · (951) 486-4000 HC Assay Blood for Ammonia | $513.55 | $513.55 | $10.58–$513.55 | — | — source file |
| Riverside Community Hospital Riverside, CA · (951) 788-3000 Ammonia | $1,272.50 | $1,272.50 | $14.57–$171.02 | — | Sep 1, 2026 source file |
| Riverside Community Hospital Riverside, CA · (951) 788-3000 AMMONIA | $1,272.50 | $1,272.50 | $190.88–$1,145.25 | — | Sep 1, 2026 source file |
Outpatient: lowest $10.64, median $180.96, highest $1,272.50 — a 119.6× difference within the same market.
As an inpatient, the same code is billed by 15 facilities here, median $202.05. 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 13 of 21 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
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.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 82140 ($91.63). 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.
| Eisenhower Medical Center Rancho Mirage, CAHC Ammonia | $7.21 | file |