CPT code 33020 denotes surgical removal of a clot or foreign body from the pericardial space. The code captures a high-acuity, invasive cardiac procedure typically performed in an operating room or other acute inpatient setting to relieve pericardial tamponade or eliminate obstructive material. Nationally, accurate coding for this service affects clinical reporting, hospital quality measures, and appropriate payment for complex cardiac surgical care. Key payers in common reimbursement and coverage discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. This publication provides a concise overview of CPT code 33020, clarifies the clinical context and typical sites of service, and summarizes what readers will learn: commonly observed billing and documentation considerations, payer coverage patterns where available, and relevant coding relationships. Data not available in the input will be identified as such in detailed sections. The content is intended for hospital administrators, coding professionals, and clinicians involved in perioperative cardiac care who need a clear reference to the clinical meaning and administrative considerations associated with CPT code 33020.