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Hospital outpatient facility services are reimbursed under the Medicare Outpatient Prospective Payment System (OPPS). Under OPPS, individual services and procedures are grouped into Ambulatory Payment Classifications (APCs) that determine payment rates, with status indicators guiding bundling and packaging logic. Cataract extraction with IOL is assigned to a surgical APC, and payment includes packaged services as applicable (e.g., some drugs, supplies, and ancillary services) per OPPS rules. Option A (MS-DRG) applies to inpatient acute care stays under IPPS, not outpatient. Option B “per diem” is not the Medicare acute inpatient methodology (that’s case-based MS-DRG), and in any case does not apply to outpatient. Option D (RBRVS) underlies physician/professional component reimbursement (e.g., CMS-1500 claims), not the facility UB-04. CCA candidates must distinguish billing forms (UB-04 vs CMS-1500), payment systems (OPPS/APC vs IPPS/MS-DRG vs RBRVS), and know how OPPS packaging and modifiers influence outpatient facility payment.