Does Medicare Cover CPM Machines?

Christian Worstell
In this article...
  • CPM machines are often utilized following surgery to help reduce joint stiffness, and Medicare may cover CPM machines if certain criteria are met. Learn more.

If CPM machine therapy is considered medically necessary, Medicare may provide coverage for a limited period of time.

Continuous passive motion machine therapy, or CPM, is often prescribed following knee or hip surgery as a way to help reduce pain and swelling and build back range of motion in the joints.

When Does Medicare Cover CPM Machine Therapy?

Generally, coverage for CPM machine therapy is provided for up to 21 days, with the coverage date starting the day after the Medicare recipient is released from the hospital.

Medicare generally considers any type of CPM machine therapy recommended for over 21 days as investigational and not medically necessary. Individuals seeking coverage under Medicare for CPM machine therapy must rent their machines from suppliers participating in the Medicare program.

Once recipients meet the Medicare criteria, they're typically responsible for 20% of CPM machine rental costs, while Medicare covers the remaining 80%. Individuals with supplemental Medigap or Medicaid may be eligible for additional coverage, so it's always a good idea to verify all out-of-pocket costs with plan providers.

How Much Do CPM Machines Cost?

While specific prices may vary depending on the supplier, CPM machines typically cost $300 to $425 for 3-week rentals and $100 per week for all subsequent weeks.

When purchased outright, CPM machines can cost up to $2,000. For Medicare recipients without supplemental coverage who rent the machines for 21 days, approximate out-of-pocket costs should range between $60 and $85.

How Do CPM Machines Work?

CPM machine therapy is especially helpful to individuals recovering from extensive procedures, as the machines help move the joints and muscles without causing extra strain on the body. CPM machines work to stimulate blood and fluid movement post-surgery, which can help improve flexibility during the recovery process.

When in use, CPM machines move the affected joints through range of motion exercises. Users can control settings, such as speed and passive motion duration, to suit their specific comfort levels, and the machines are designed with special frames to conform to each user's body. 

Why Have Some Surgeons Stopped Prescribing CPM Machines?

While research has shown the benefits of CPM therapy in certain situations, some medical professionals feel the machines should not be prescribed following total knee replacement procedures. This is due to new studies that indicate CPM machines don't aid in improving full range of motion for total knee replacement recipients.

However, additional studies have shown that CPM therapy may be beneficial when started early in treatment regimens and following ACL reconstruction construction procedures. Since the results of CPM therapy can vary on a case-by-case basis, individuals should consult with their physicians regarding potential outcomes and benefits. 

Christian Worstell
About the Author

Christian Worstell is a senior Medicare and health insurance writer with He is also a licensed health insurance agent. Christian is well-known in the insurance industry for the thousands of educational articles he’s written, helping Americans better understand their health insurance and Medicare coverage.

Christian’s work as a Medicare expert has appeared in several top-tier and trade news outlets including Forbes, MarketWatch, WebMD and Yahoo! Finance.

While at HelpAdvisor, Christian has written hundreds of articles that teach Medicare beneficiaries the best practices for navigating Medicare. His articles are read by thousands of older Americans each month. By better understanding their health care coverage, readers may hopefully learn how to limit their out-of-pocket Medicare spending and access quality medical care.

Christian’s passion for his role stems from his desire to make a difference in the senior community. He strongly believes that the more beneficiaries know about their Medicare coverage, the better their overall health and wellness is as a result.

A current resident of Raleigh, Christian is a graduate of Shippensburg University with a bachelor’s degree in journalism. You can find Christian’s most recent articles in our blog.

If you’re a member of the media looking to connect with Christian, please don’t hesitate to email our public relations team at

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