Final answer:
The correct code for anesthesia services for a morbidly obese patient undergoing total knee replacement is 01402-P3-AA, indicating a severe systemic disease and personal performance by an anesthesiologist.
Step-by-step explanation:
The correct answer to the question is a) 01402-P3-AA. This code is used for anesthesia services provided to a patient undergoing a total knee replacement procedure. The code 01402 is specific to anesthesia for procedures on the knee joint.
The modifier 'P3' indicates that the patient has a severe systemic disease, which in this case is morbid obesity, thus increasing the complexity of the management of anesthesia. The 'AA' modifier is used to indicate that the anesthesia services were personally performed by an anesthesiologist.