Block 24 I requires which specific information?

Block 24 I on the CMS-1500 form requires the ID qualifier, which is essential for indicating the type of identification used for the provider or patient. This information helps insurance companies to accurately process claims by identifying what kind of ID is being referenced, such as the provider's National Provider Identifier (NPI) or a unique patient identification number.

This block is critical because it clarifies the specific type of ID, reducing potential confusion during the claims process and ensuring that the claim is recognized and processed correctly. Accurate identification helps to streamline the billing process and decrease the likelihood of claim denials due to insufficient information.

As for the other options, while the provider's NPI, patient’s primary insurance ID, and total service fees are all vital components of the claim, they do not belong in Block 24 I specifically, making the ID qualifier the correct focus for this block.