Which statement about NPI and taxonomy codes is true?

• A. NPI identifies the provider and taxonomy classifies the specialty; both are required for proper billing.
• B. NPI is the same as CPT.
• C. Taxonomy codes change with each claim and are optional.
• D. They are used only for patient scheduling.

Answer: (A)

NPI and taxonomy codes work together to identify who billed a service and what their specialty is, which helps payers process claims accurately. The NPI is a unique 10-digit identifier for each individual clinician or practice group, used on the claim to show who rendered the service. The taxonomy code describes the provider’s type and specialty, helping insurers understand the provider’s credentialed role and ensuring the service is billed under the correct category.

This is why the statement that NPI identifies the provider and taxonomy classifies the specialty, and that both are required for proper billing, is true. CPT codes, by contrast, describe the procedures or services performed, not who performed them, so they’re a different coding system from the NPI. Taxonomy codes aren’t meant to change with every claim and aren’t optional in billing; they help with credentialing, payer eligibility, and correct routing of claims, not just scheduling.