Should You do Medical Billing for Excision or Incision? The two medical billing terms excision and incision sound quite similar, but they are actually quite different in definition. There are certain situations in which it can be very confusing whether an incision & drainage code should be used, or and excision code. If you know the rules, the question of when to bill for an excision over an incision & drainage is a simple medical billing rule. Let’s look at an example. Your surgeon has a patient that has a sebaceous cyst. He/she needs to check and see if that cyst is benign or malignant. The surgeon goes in with …