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Reimbursement

Ambulatory Payment Classification(APC)

In one line

The Medicare grouping system that determines hospital outpatient payment amounts under OPPS, analogous to MS-DRGs for inpatient.

Definition

Ambulatory Payment Classifications (APCs) are the unit of payment under the Medicare Hospital Outpatient Prospective Payment System (OPPS), established by the Balanced Budget Act of 1997 and effective August 2000. CMS groups outpatient procedures with similar clinical characteristics and resource use into APCs and pays a single bundled amount per APC, with status indicators that determine whether the service is separately payable, packaged into another APC, or excluded.

Why it matters

APC assignment plus pass-through status (TPT) determines the outpatient economics of a new device. Many MedTech launch strategies hinge on securing a favorable APC and, where eligible, transitional pass-through payment.

Common pitfalls

•Assuming an inpatient NTAP equivalent exists in OPPS — it does not; the outpatient analog is TPT.
•Missing the annual OPPS comment window (June-September) for APC reassignment requests.

Sources

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Why compare MedTech terms side by side?

MedTech terminology is full of pairs that look interchangeable but carry very different regulatory, clinical, and commercial consequences. Picking the wrong framework, pathway, or standard early in a project can add months to a submission, invalidate clinical evidence, or trigger an audit finding. Side-by-side comparison is the fastest way to surface those differences before they become costly mistakes.

Each comparison on this page pulls from the same vendor-neutral, sourced definitions used throughout the MedTech Terms glossary. You see the one-line summary, the formal definition, why it matters in practice, common pitfalls, and the primary sources (FDA guidance, EU MDR/IVDR articles, ISO/IEC standards, MDCG documents, IMDRF principles) that back each entry. That makes the comparison defensible in regulatory strategy memos, design reviews, and submission narratives.

Common comparison patterns

Regulatory pathway choice - 510(k) vs PMA, 510(k) vs De Novo, Abbreviated vs Special 510(k).
Quality systems - QSR vs ISO 13485, QMSR vs QSR.
Software classification - SaMD vs SiMD, Locked vs adaptive AI.
EU frameworks - MDR vs IVDR, CE Mark vs UKCA.
Cybersecurity artifacts - SPDX vs CycloneDX SBOM, CVE vs CVSS.
Post-market actions - Recall vs field action, Removal vs correction.

How to use this tool

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MedTech Terms is a vendor-neutral community resource sponsored by Blue Goat Cyber. Definitions are written for educational use and are not legal or regulatory advice.