CPT codes describe the services and/or procedures for which reimbursement is sought.

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CPT codes function as the billing language for medical services. They describe the actual services and procedures performed during a patient encounter, such as exams, tests, surgeries, or other procedures, so the payer knows exactly what to reimburse. Diagnoses, coded with ICD-10-CM, explain why the service was needed but are not the description of the service itself. That separation is why CPT codes focus on the service or procedure, while ICD codes justify medical necessity. Patient satisfaction and insurance eligibility relate to quality or payer status, not the specific service description being billed. In practice, CPT codes are used alongside diagnosis codes and sometimes modifiers to determine proper reimbursement.