In simple words: This code covers one gallon of a special acidic solution used in dialysis. It's mixed with other fluids in the dialysis machine to help remove harmful waste products from the blood.

This code represents a single gallon of acid concentrate solution used in hemodialysis. The provider adds this solution to the dialysate in a dialysis machine to neutralize accumulating harmful acids in the patient's body. The acid concentrate typically contains chloride salts of sodium, potassium, magnesium, and calcium, along with glucose monohydrate and an organic acid (such as glacial acetic acid, lactic acid, or citric acid). The purpose of the acid is to maintain the dialysate's pH below 7.3, preventing calcium and magnesium from precipitating out of the solution when bicarbonate is added.

Example 1: A patient with end-stage renal disease receives hemodialysis three times a week. Code A4709 is used to bill for each gallon of acid concentrate solution utilized during these treatments., A patient experiencing acute kidney injury requires temporary hemodialysis. A4709 is used to bill for the acid concentrate used during these sessions., During a hemodialysis session, a patient develops metabolic acidosis. The clinician increases the concentration of acid concentrate in the dialysate to help correct the imbalance, and A4709 is used to bill for the additional solution.

Documentation should include the total amount of acid concentrate used (in gallons), the diagnosis necessitating dialysis, and any relevant clinical details about the patient's condition and response to treatment.