Block 17b on the CMS-1500 form is used for which purpose?

Block 17b on the CMS-1500 form is used for which purpose?

• A. Referring provider's NPI
• B. NPI of referring provider
• C. Service facility location
• D. Billing provider address

Answer: (B)

Block 17b is the place to put the NPI of the referring provider—the unique identifying number assigned to that clinician who referred the patient for service. This field ensures the claim clearly links the services to the correct referring provider across payers, which supports accurate adjudication and credits the right clinician for the referral. The National Provider Identifier is the standard identifier used in HIPAA transactions, so including it here helps standardize and streamline processing. Other data about location or the billing provider would appear in different blocks, not in this 17b field.

Block 17b is the place to put the NPI of the referring provider—the unique identifying number assigned to that clinician who referred the patient for service. This field ensures the claim clearly links the services to the correct referring provider across payers, which supports accurate adjudication and credits the right clinician for the referral. The National Provider Identifier is the standard identifier used in HIPAA transactions, so including it here helps standardize and streamline processing. Other data about location or the billing provider would appear in different blocks, not in this 17b field.