a medical waste disposal system includes an assembly for superheating a quantity of untreated medical waste which is partially saturated with water to an internal temperature of at least 275 degrees fahrenheit for at least thirty minutes . after such superheating the vessel is rotated to cool the same to under 100 degrees fahrenheit after which the contents are deposited into a matrix of grinding elements having surfaces of different grinding dimensions and capabilities such that the output thereof is unrecognizable as medical waste . such output is then deposited into a microwave assembly to further disinfect and decontaminate the medical waste . after such treatment the output of the system may be treated in the same fashion as conventional household refuse .