AAPC CPCO Certification Practice Exam 2025 – Complete Study Resource

The correct choice emphasizes the critical information needed for laboratory billing using the CMS-1500 form. The CLIA number is essential because it identifies the laboratory performing the tests and verifies that it is certified to carry out laboratory tests. Including the date of service is necessary to establish when the lab work was performed, which is crucial for insurance claims processing and for tracking patient data. The NPI (National Provider Identifier) number identifies the healthcare provider and facilitates billing through standardization.

Collectively, these pieces of information ensure accurate processing of claims, compliance with regulations, and effective communication with insurance payers. Other options such as the patient's medical history or just the insurance policy number lack the specificity and completeness required for proper billing under CMS guidelines. Similarly, while diagnosis codes and treatment dates are important, they are not as specific as the required identifiers for laboratory billing on the CMS-1500 form.