Yes, 270.6.[elevated amounts of ammonia in the blood (hyperammonemia)].
When adults experience mental changes, disorientation, sleepiness, or lapse into a coma, an ammonia level may be ordered to help evaluate the cause of the change in consciousness, it helps to diagnose the cause of a coma of unknown origin or to help support the diagnosis of Reye’s syndrome or hepatic encephalopathy caused by various liver diseases. An ammonia level may also be ordered to help detect and evaluate the severity of a urea cycle defect.
In patients with stable liver disease, an ammonia level may be ordered, along with other liver function tests, when a patient suddenly “takes a turn for the worse” and becomes more acutely ill.