Medicare does not pay for stem cell therapy for knees. Stem cell injections for knee osteoarthritis, knee pain, or any other orthopedic condition are considered experimental, and Medicare classifies them as not medically reasonable and necessary. This applies to all types of stem cell knee treatments, whether the cells come from your own bone marrow, fat tissue, or a donor source.
Why Medicare Won’t Cover It
Medicare coverage requires that a treatment be FDA-approved for its intended use. The only stem cell products currently approved by the FDA are blood-forming stem cells derived from umbilical cord blood, and those are approved solely for blood disorders. The FDA has stated explicitly that regenerative medicine therapies have not been approved for the treatment of any orthopedic condition, including osteoarthritis, tendonitis, hip pain, knee pain, back pain, or shoulder pain.
Because no stem cell product has FDA approval for knee treatment, Medicare has no pathway to cover it as a standard benefit. Local Coverage Determinations from Medicare contractors reinforce this position. Platelet-rich plasma (PRP) injections, which are sometimes marketed alongside or combined with stem cells, are also excluded. At least one major Medicare contractor, Noridian Healthcare Solutions, has issued a blanket non-coverage policy for all PRP injections for musculoskeletal injuries and joint conditions, whether used alone or combined with stem cells.
The Clinical Trial Exception
There is one narrow scenario where Medicare might cover costs related to stem cell therapy: participation in a qualifying clinical trial. Medicare’s national coverage policy for stem cell transplantation allows coverage when the treatment is part of a clinical research study that meets specific requirements. The study must be registered on ClinicalTrials.gov before enrolling its first patient, must have a written protocol that meets Medicare’s standards, and must commit to publicly releasing all outcomes, including negative results.
In practice, this exception is designed primarily for blood-related stem cell transplants, not knee injections. Finding a Medicare-qualifying clinical trial specifically for stem cell knee therapy would be unusual, though not impossible. If you’re interested, searching ClinicalTrials.gov for knee osteoarthritis stem cell studies in your area is the most direct way to check.
What You’d Pay Out of Pocket
Without insurance coverage, stem cell knee injections in the United States typically cost between $5,000 and $12,000 per knee. Treatments that use your own cells harvested from bone marrow or fat tissue tend to cost more because of the additional extraction procedure. The global average ranges from $3,000 to $8,000 per knee, with lower prices available in countries like Mexico ($2,000 to $4,000) and Turkey ($3,000 to $5,500).
Many clinics offering these treatments require full payment upfront and may recommend multiple sessions. Because the treatments lack FDA approval, there’s no standardized protocol, which means the exact procedure, cell source, and number of injections can vary significantly from one provider to the next.
Knee Treatments Medicare Does Cover
If you’re dealing with knee osteoarthritis, Medicare covers several treatments along the typical progression of care. These include physical therapy, anti-inflammatory medications, and corticosteroid injections as initial steps.
Hyaluronic acid injections (viscosupplementation) are covered under Medicare Part B when you meet all of the following criteria: you have symptomatic osteoarthritis causing pain that interferes with daily activities like walking or standing, you’ve tried and failed at least three months of conservative treatment (physical therapy, exercise, weight management, pain medications), and you’ve either failed or can’t tolerate corticosteroid injections. If a first round of hyaluronic acid injections helps, Medicare will cover repeat series as long as at least six months have passed, symptoms have returned, and you experienced meaningful improvement from the previous round.
For more advanced disease, Medicare covers total knee replacement surgery when conservative treatments have been tried for at least three months without adequate relief, and imaging confirms significant joint damage such as joint space narrowing, bone spurs, or cysts beneath the cartilage surface. Partial knee replacement and revision surgeries are also covered when medically necessary.
Why Clinics May Suggest Otherwise
Some clinics advertise stem cell therapy as if it’s a covered or mainstream treatment. A few may attempt to bill Medicare using general injection codes, but this can result in claim denials and potential fraud investigations. If a clinic tells you Medicare will cover stem cell injections for your knee, that’s a significant red flag. The FDA has actively warned consumers about clinics marketing unapproved stem cell treatments and has taken enforcement action against some providers.
The science behind stem cell therapy for knees is still evolving. Some early studies show promise for pain relief and cartilage repair, but the evidence isn’t yet strong enough for FDA approval or Medicare coverage. Until that changes, the full cost falls on the patient.