In which block on the CMS-1500 form should the prior authorization number be entered?

The prior authorization number should be entered in block 23 of the CMS-1500 form. This block is specifically designated for additional information related to the claim, such as the prior authorization number, which the payer may require to process the claim. The inclusion of the prior authorization number in this block is important as it identifies claims that have been pre-approved for coverage, streamlining the billing process and reducing the chances of payment delays due to missing authorization.

In contrast, other blocks have different purposes. For instance, block 21 is used for diagnosis codes, block 22 pertains to resubmitted claims, and block 24 is designated for service line details. Understanding the specific function of each block on the CMS-1500 form is crucial for accurate claim submission and effective billing practices.