Final answer:
The most likely cause for the information on CMS 1500 in 24J being the same as the information in 32a is that the provider is enrolled as a sole proprietor and only has an individual NPI.
Step-by-step explanation:
The most likely cause for the information on CMS 1500 in 24J being the same as the information in 32a is that the provider is enrolled as a sole proprietor and only has an individual NPI. When a provider operates as a sole proprietor, they don't have a separate NPI for their business entity, so their individual NPI is used for both 24J and 32a. This is a common scenario for healthcare providers who are not incorporated or part of a larger organization.