When a service like Remote Patient Monitoring (RPM) or Chronic Care Management (CCM) is provided, Medicare pays for it. But how much they pay depends entirely on where the service takes place. This creates two parallel worlds of reimbursement: one for independent physician practices and another for hospitals.

For a private practice, reimbursement is governed by the Physician Fee Schedule (PFS). It's a comprehensive list of fees Medicare pays for services and procedures performed by doctors and other healthcare professionals. The PFS payment is designed to cover the professional work involved—the clinician's time, expertise, and practice expenses like staff and supplies.

Things change when a physician practice is owned by a hospital. Services performed in these hospital-owned outpatient departments are billed under a different system: the Hospital Outpatient Prospective Payment System (OPPS). This system is designed to cover the hospital's higher overhead costs. The result is two separate payments for the same service: one for the physician's work (the professional fee, similar to the PFS) and an additional, often larger, payment called a 'facility fee.'

This payment difference creates a clear financial incentive. A hospital system can acquire an independent physician practice, re-designate it as a hospital outpatient department, and immediately start billing for the same services under the more lucrative OPPS. This generates a higher reimbursement for the exact same patient care, often delivered by the same doctor in the same building. This is often called an arbitrage opportunity in healthcare economics.

This practice, known as 'site-shifting', has contributed to the consolidation of healthcare, with hospitals acquiring private practices at a rapid rate. While hospitals argue the facility fees are necessary to cover the higher costs of maintaining their infrastructure and readiness for complex cases, critics point out that it drives up costs for both Medicare and patients without a corresponding improvement in care quality for routine services.

The significant cost differences between these settings have not gone unnoticed. An independent congressional agency called MedPAC has the job of advising Congress on issues affecting the Medicare program. For years, MedPAC has highlighted these payment disparities and their impact on rising healthcare spending.

MedPAC's research and recommendations are a primary driver behind the push for 'site-neutral payments.' The core idea is simple: Medicare should pay the same amount for a service, regardless of where it's performed, unless there is a clear clinical reason for the price difference.

This fundamental tension between the PFS and OPPS, and the regulatory efforts to bridge the gap through site-neutrality, sets the stage for the major rule changes proposed for the coming years. Understanding this underlying conflict is key to analyzing why these changes are happening and what they aim to achieve.