Ammonia test cost in Washington, DC — inpatient
In Washington-Arlington-Alexandria, DC-VA-MD-WV, 11 hospitals list a cash price for ammonia blood test as an inpatient: from $63.00 to $173.77, with a median of $145.50. The lowest listed price is at Sentara Northern Virginia Medical Center — $82.50 less than the median here. Across District of Columbia, the median is $146.00 at 5 hospitals.
Cash prices at 11 facilities across 7 cities for code 82140, as an inpatient (admitted to hospital) . 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 Washington-Arlington-Alexandria, DC-VA-MD-WV.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Sentara Northern Virginia Medical Center lowest Woodbridge, VA · (703) 523-1000 Chgl Ammonia Stat | $63.00 | $126.00 | — | 50% | Apr 1, 2026 source file |
| Sentara Northern Virginia Medical Center lowest Woodbridge, VA · (703) 523-1000 Chgl Ammonia,Urine (Ks Panel) | $63.00 | $126.00 | — | 50% | Apr 1, 2026 source file |
| Sentara Northern Virginia Medical Center lowest Woodbridge, VA · (703) 523-1000 Chgl Ammonia Arterial | $63.00 | $126.00 | — | 50% | Apr 1, 2026 source file |
| National Rehabilitation Hospital Washington, DC AMMONIA | $78.58 | $120.89 | $59.24–$102.76 | 35% | Apr 1, 2026 source file |
| Children's National Rehabilitation and Specialized Care Washington, DC AMMONIA BLOOD | $103.50 | $207.00 | $140.76–$196.65 | 50% | — source file |
| Inova Alexandria Hospital Alexandria, VA · (703) 504-3167 HC AMMONIA | $145.50 | $291.00 | $14.35–$226.98 | 50% | — source file |
| Inova Fairfax Hospital Falls Church, VA · (703) 698-1110 HC AMMONIA | $145.50 | $291.00 | $14.35–$226.98 | 50% | — source file |
| Inova Fair Oaks Hospital Fairfax, VA · (703) 391-4170 HC AMMONIA | $145.50 | $291.00 | $14.35–$226.98 | 50% | — source file |
| Inova Loudoun Hospital Leesburg, VA · (703) 858-6600 HC AMMONIA | $145.50 | $291.00 | $14.35–$226.98 | 50% | — source file |
| Inova Mount Vernon Hospital Alexandria, VA · (703) 664-7105 HC AMMONIA | $145.50 | $291.00 | $14.35–$226.98 | 50% | — source file |
| Children's National Hospital Washington, DC · (202) 476-5000 Ammonia Level | $146.00 | $292.00 | $122.64–$159.72 | 50% | — source file |
| MedStar Washington Hospital Center Washington, DC · (202) 877-7000 AMMONIA | $164.98 | $253.82 | $73.61–$215.75 | 35% | Apr 1, 2026 source file |
| MedStar Georgetown Hospital Northwest Washington, DC · (202) 784-3000 AMMONIA | $173.77 | $267.34 | $93.57–$240.61 | 35% | Apr 1, 2026 source file |
Inpatient: lowest $63.00, median $145.50, highest $173.77 — a 2.8× difference within the same market.
As an outpatient, the same code is billed by 18 facilities here, median $145.50 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 10 of 10 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.
1 row held back from this comparison
It is priced below $1 or below a tenth of the national median for code 82140 ($91.20). 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.
| Sentara Northern Virginia Medical Center Woodbridge, VAChgl (Qu) 82140 Stonerisk? Diagnostic Profile, S/O | $8.50 | file |