What should be entered in Block 30?

In Block 30 of the CMS-1500 form, it is appropriate to leave it blank. This block is designed for information regarding a patient's secondary insurance, but if the patient does not have secondary insurance, or if it is not applicable for the claim being submitted, it should indeed be left empty.

Filling in this block without the necessary information can lead to confusion or delays in processing the claim, as insurers may misinterpret or overlook the entries if they do not align with their requirements. Therefore, adhering to the instruction to leave it blank when no secondary insurance is available is the correct course of action.

Understanding this block's purpose is crucial for accurately completing the CMS-1500 form and facilitating efficient claims processing.