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Outpatient Prospective Payment System
Medicare's payment system for hospital outpatient services.
Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed May 5, 2026
Definition
OPPS pays hospital outpatient departments via Ambulatory Payment Classifications (APCs) - bundled payment groups for outpatient procedures. ASCs are paid under a parallel ASC payment system tied to OPPS. CMS updates OPPS each year through a proposed rule in the summer and a final rule effective January 1. APCs group services that are clinically and financially similar, and comprehensive APCs bundle related services into one payment. The rule also sets device-intensive status, which affects how payment changes when procedures move to ASCs. What the regulation says
The Centers for Medicare & Medicaid Services (CMS) administers the Outpatient Prospective Payment System (OPPS), which establishes payment rates for hospital outpatient services and partial hospitalization services in psychiatric hospitals and community mental health centers. The Social Security Act, specifically sections 1833(t) and 1833(a)(2)(E), provides the legal framework for OPPS. CMS updates the OPPS regulations annually, typically through proposed and final rules published in the Federal Register, detailing payment policies and rates.What this means in practice
Annual OPPS rule sets APC weights, device pass-throughs, and ASC-payable procedure list - a major commercial determinant for outpatient devices.Examples
- A manufacturer of a novel cardiac diagnostic device for outpatient use ensures the device has sufficient clinical evidence to support a favorable Ambulatory Payment Classification (APC) assignment under OPPS.
- A company developing an orthopedic implant specifically for ambulatory surgical centers (ASCs) analyzes the annual OPPS rule to confirm its device is included in procedures payable under the parallel ASC payment system.
- A MedTech firm applies for Transitional Pass-Through status for a new surgical instrument, seeking temporary separate payment under OPPS while CMS gathers data for its permanent integration into an Ambulatory Payment Classification (APC).
Common pitfalls
- •A common pitfall is misunderstanding the impact of APCs on device reimbursement, assuming direct payment for devices rather than bundled payments for procedures. Another mistake is failing to monitor the annual OPPS rule changes, which can significantly affect market access and pricing strategies for outpatient MedTech. Companies sometimes overlook the distinct but parallel payment system for Ambulatory Surgical Centers (ASCs), leading to incomplete reimbursement strategies.
- •It is crucial to differentiate between an outpatient service being covered by Medicare and the specific payment methodology under OPPS, as not all covered services are reimbursed via APCs.
- •Some MedTech manufacturers incorrectly assume that device pass-through status is permanent, rather than a temporary payment mechanism subject to specific criteria and time limits.
- •Misinterpreting the APC assignment for a new device, or assuming a specific APC will apply without understanding the clinical and cost data CMS uses for classification, can lead to inaccurate financial projections.
Frequently asked questions
MedTech companies primarily interact with OPPS by understanding how their devices are incorporated into Ambulatory Payment Classifications (APCs), monitoring device pass-through opportunities, and assessing the impact of annual rule changes on market access and reimbursement for their outpatient products.
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Sources
2 sourcesSources support the definition or relevant regulatory context, not necessarily every claim on this page. Each is graded against our source-tier hierarchy so you can see what rests on binding law versus commentary.
Official citation replacements checked: . Medicare documents support Medicare coding, coverage or payment context, not every payer policy or CPT editorial procedure. Citation replacement does not change the full term review date.
Tier 1Binding law and standards· 1Tier 2Regulator guidance and consensus· 1
Link health: 1 verified 1 unchecked· last checked 2026-06-20
CMS·1eCFR·1
- 1CMS OPPSTier 2 VerifiedCMScms.gov
- 242 CFR 419.31: Ambulatory payment classification systemTier 1 UncheckedeCFRecfr.gov
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