In healthcare, APM stands for Alternative Payment Model. These are payment structures designed to move away from the traditional fee-for-service system, where doctors and hospitals get paid for every test, procedure, and visit they perform. Instead, APMs tie a portion of provider payment to the quality and efficiency of care delivered. The goal is straightforward: reward better health outcomes rather than a higher volume of services.
How APMs Differ From Fee-for-Service
The original Medicare system, launched in 1966, paid providers for each individual service they delivered. Under that model, reimbursement was based on the quantity and complexity of diagnostic tests and treatments. The more a provider did, the more they earned, regardless of whether the patient actually got better. This created a financial incentive to over-test and over-treat.
APMs flip that incentive. Rather than paying per service, these models hold providers accountable for the total cost and quality of care across a patient’s treatment. If a group of doctors keeps their patients healthier and avoids unnecessary hospital stays, they share in the savings. If costs run higher than expected, providers may face financial penalties. This sharing of financial risk is the defining feature that separates APMs from the old pay-per-visit approach.
Common Types of APMs
APMs come in several forms, each structured around a different piece of the healthcare puzzle.
Accountable Care Organizations (ACOs)
An ACO is a group of doctors, hospitals, and other providers who voluntarily come together to coordinate care for a defined group of patients. In Medicare’s Shared Savings Program, the largest ACO initiative, the group agrees to be held accountable for both the quality and cost of care for its assigned patients. When the ACO spends less than its target while meeting quality benchmarks, it keeps a share of the savings. When it spends more, it may owe money back.
Bundled Payments
Bundled payment models set a single price for an entire episode of care rather than billing separately for the surgeon, the hospital stay, the anesthesiologist, and the physical therapy. A joint replacement is the classic example. CMS has proposed a new bundled payment model launching in 2026 covering five surgical episodes: lower extremity joint replacement, hip and femur fracture surgery, spinal fusion, coronary artery bypass graft, and major bowel procedures. These work best for planned surgeries where the course of treatment is relatively predictable. Chronic conditions like heart failure are harder to bundle because patients arrive at very different stages of disease. In existing bundled payment programs, 78% of hospitals saw payments decrease for major joint replacement, compared with only 46% for congestive heart failure.
Primary Care Medical Homes
These models focus on strengthening primary care by paying practices a per-patient monthly fee on top of regular visit payments. The extra funding supports care coordination, after-hours access, and follow-up for patients with complex needs. CMS tested this through its Comprehensive Primary Care Plus program, which paid participating practices a quarterly care management fee not tied to office visits.
The Role of MACRA and Advanced APMs
The Medicare Access and CHIP Reauthorization Act, passed in 2015, created a formal pathway pushing clinicians toward value-based payment. Under MACRA’s Quality Payment Program, clinicians can participate in one of two tracks. The first adjusts Medicare payments based on quality reporting scores. The second offers a bonus to clinicians who participate meaningfully in what CMS calls an “Advanced APM.”
Not every APM qualifies as Advanced. To earn that designation, a model must require providers to use certified electronic health record technology, tie payments to quality measures that include at least one outcome measure, and expose providers to real financial risk. Specifically, the total amount an APM entity could owe back to CMS must equal at least 8% of its average estimated Medicare revenue. Clinicians who receive at least 75% of their Medicare payments through an Advanced APM earn a 5% bonus on their fee schedule payments.
How Many Clinicians Participate
Participation has grown steadily. The number of clinicians qualifying for the Advanced APM bonus rose from about 100,000 in 2019 to over 384,000 in 2024, according to MedPAC data. For context, roughly 1.1 million clinicians billed Medicare for more than 15 fee-for-service patients in 2022. So while participation is climbing, most clinicians still operate primarily under traditional payment. CMS has set an ambitious target of having 100% of traditional Medicare beneficiaries in an accountable care relationship by 2030.
What This Means for Patients
If your doctor participates in an APM, the day-to-day experience of receiving care may not feel dramatically different. You still see the same providers, visit the same facilities, and receive the same treatments. The changes happen behind the scenes in how your providers communicate with each other, how closely they track your progress after a hospital stay, and how motivated they are to prevent complications that lead to readmissions.
The evidence on patient outcomes is mixed so far. Reducing hospital readmissions has been a major focus, and better preparation for discharge is associated with meaningfully lower readmission rates. One analysis estimated that nationwide improvements in discharge preparation could prevent over 3,000 readmissions per year, saving roughly $47 million. However, the same study found that hospital participation in APMs alone did not significantly improve how well patients felt prepared for going home. The financial incentives, in other words, haven’t automatically translated into better patient-facing communication.
Challenges Providers Face
Adopting an APM is not simple. The most frequently cited barrier is administrative burden. Tracking quality measures, reporting outcomes data, and managing shared savings calculations requires infrastructure that many smaller practices lack. Lengthy bureaucratic processes and regulatory delays slow implementation further. Legal and privacy concerns around data sharing between providers also complicate matters, particularly when APMs require coordinating care across multiple organizations that use different record systems.
There’s also the basic financial reality: fee-for-service remains more profitable and less complicated for many providers. Taking on financial risk means a practice could earn less, not more, if its patient population turns out to be sicker or harder to manage than projected. For providers weighing the transition, the upside has to clearly outweigh the cost of retooling their operations.