They compare paid claim information against the provider's clinical documentation - verifying the assigned ICD-10-CM, CPT, and HCPCS codes to confirm coding accuracy, ensure medical necessity, detect overpayments or underpayments, and confirm compliance with Medicare policy. 3+ years of direct experience in medical coding, medical billing, and/or coding quality assurance/auditing in a healthcare environment, including ICD-10-CM/PCS, CPT/HCPCS, and DRG/APR-DRG coding systems.