Which box should contain the NPI number or identifier for a referring physician?

The NPI (National Provider Identifier) number for a referring physician is required to ensure accurate identification of healthcare providers involved in a patient's care. In the context of medical billing forms, specifically the CMS-1500 form, specific boxes are designated for various types of information.

The correct box for entering the NPI number of a referring physician is Box 17b. This box is specifically intended for the NPI of the referring or ordering physician if different from the billing provider. This distinction is crucial, as it helps insurance companies and other payers track and verify the details of the healthcare services provided, ensuring proper adjudication of claims.

Other boxes, such as Box 10, Box 11, and Box 12, serve different purposes—Box 10 is usually for the patient's condition or treatment information, Box 11 focuses on the insurer or payer, and Box 12 indicates the patient’s signature or acceptance of responsibility, none of which pertain to the NPI of the referring physician. Therefore, Box 17b is the appropriate choice for documenting the NPI number, ensuring clarity and compliance in medical billing practices.