Does Insurance Cover Knee Gel Injections? Medicare, Private Insurance, and What You'll Pay

Insurance coverage is one of the biggest questions patients have when considering gel injections for knee pain. It is a practical question that deserves a clear, detailed answer — because the cost of treatment should never be a mystery when you arrive for your appointment.

The good news: most patients with knee osteoarthritis have insurance coverage for viscosupplementation, whether through Medicare, private insurance, or Medicare Advantage plans. The specifics — what you pay, whether you need prior authorization, and how to avoid surprise costs — vary by plan, and that is what this article covers in detail.

At Joint Relief Institute, we verify every patient’s insurance coverage before scheduling. After more than 400,000 procedures across our three Chicago-area locations, we have worked with virtually every insurance plan available in the region. Here is what you need to know.

Medicare Coverage for Knee Gel Injections

Medicare is the most common insurance pathway for gel injections, and the coverage is straightforward. A significant portion of osteoarthritis patients are 65 or older, making Medicare Part B the primary payer for many viscosupplementation treatments [1].

What Medicare Part B Covers

Medicare Part B classifies viscosupplementation as a medically necessary outpatient procedure for patients with knee osteoarthritis. This means it is covered under the same framework as other physician-administered treatments — not as a prescription drug (which would fall under Part D) [1].

The coverage structure:

• Medicare pays 80% of the Medicare-approved amount for the procedure
• The patient pays the remaining 20% coinsurance
• The annual Part B deductible ($257 in 2026) must be met first
• No lifetime limit on the number of treatment courses

What Medicare requires for coverage:

• A documented diagnosis of knee osteoarthritis (typically confirmed by X-ray showing joint space narrowing or other degenerative changes)
• Clinical documentation that the treatment is medically necessary
• The procedure must be performed by an enrolled Medicare provider
• The hyaluronic acid product must be FDA-approved for intra-articular use [2]

Medicare does not impose a rigid step-therapy requirement the way some private insurers do, but documentation of the clinical rationale for viscosupplementation should be present in the medical record.

Medigap (Medicare Supplement) Coverage

Here is where many Medicare patients discover their costs are lower than expected. Medigap policies — also called Medicare Supplement plans — are designed specifically to cover the gaps in Original Medicare, including the 20% coinsurance [3].

Plan F (available to those eligible before January 1, 2020): Covers the Part B coinsurance in full. Patients with Plan F typically pay nothing out of pocket for gel injections after their deductible is met.

Plan G (the most popular current supplement plan): Covers the Part B coinsurance in full after the patient pays the annual Part B deductible. Once the deductible is met, out-of-pocket costs for gel injections are typically zero [3].

Plan N: Covers the Part B coinsurance but may apply a copay of up to $20 for certain office visits. Patients with Plan N may pay a small copay per injection visit.

Other supplement plans (Plans A, B, C, K, L): Coverage varies. Plans K and L cover 50% and 75% of coinsurance respectively.

The bottom line: if you have Medicare Part B plus a Medigap supplement plan, your out-of-pocket cost for knee gel injections is often minimal or zero.

Medicare Advantage (Part C) Coverage

Medicare Advantage plans (offered by private insurers like UnitedHealthcare, Humana, Aetna, and others) replace Original Medicare with a managed care structure. Most Medicare Advantage plans cover viscosupplementation, but the details differ from Original Medicare [4]:

• Copays may apply instead of coinsurance (a fixed dollar amount per visit rather than a percentage)
• Prior authorization may be required before the procedure
• Network restrictions apply — you must use an in-network provider
• Referral requirements vary by plan

If you have a Medicare Advantage plan, verifying coverage and network status before scheduling is especially important. The plan’s member services line or your provider’s billing department can confirm the specifics.

For a more detailed breakdown of Medicare coverage specifically, see our guide on Medicare coverage for knee gel injections.

Private Insurance Coverage

Most major private insurance carriers cover viscosupplementation for knee osteoarthritis as a medically necessary procedure. This includes [5]:

• Blue Cross Blue Shield (various state plans)
• Aetna
• UnitedHealthcare
• Cigna
• Humana
• Anthem
• United American
• Health Alliance

Coverage is not universal across all plan configurations within each carrier. An employer-sponsored PPO plan from Blue Cross may have different coverage terms than an individual HMO plan from the same company. The carrier’s medical policy for viscosupplementation and your specific plan benefits both determine coverage.

What Private Insurers Typically Require

Most private insurance companies apply a version of the following criteria before covering gel injections:

1. Confirmed diagnosis. An X-ray or other imaging showing osteoarthritis of the knee (typically Kellgren-Lawrence grade 2 or higher). A clinical diagnosis alone may not be sufficient for some carriers.

2. Failed conservative treatment. Documentation that the patient has tried and not adequately responded to at least one or more of the following:

• Over-the-counter or prescription NSAIDs (ibuprofen, naproxen, meloxicam)
• Physical therapy
• Weight management recommendations
• Cortisone injection

This does not mean you need to fail every option — most insurers require evidence of attempting one or two conservative approaches [5].

3. Medical necessity documentation. A clinical note from the treating or referring physician explaining why viscosupplementation is medically appropriate for this patient.

These requirements are standard medical documentation that any competent provider maintains as part of routine care. They are not onerous barriers.

Prior Authorization: What to Expect

Prior authorization is a process where your insurance company reviews and approves a procedure before it is performed. Not all insurers require it for viscosupplementation, but many do [6].

How It Works

1. Your provider submits a request to your insurance company, including your diagnosis, treatment history, and the specific hyaluronic acid product planned
2. The insurer reviews the request against their medical policy criteria
3. A decision is issued — typically within 5 to 15 business days for non-urgent requests
4. If approved, the procedure is scheduled with confirmed coverage
5. If denied, the insurer provides a reason and the provider can appeal

Common Reasons for Denial

• Insufficient documentation of conservative treatment failure. The most frequent reason. The fix is straightforward: ensure the referring physician provides detailed notes about prior treatments attempted.
• Missing or incomplete authorization request. An administrative issue resolved by resubmission.
• Non-FDA-approved product. Rare, but some insurers have preferred product lists. Switching to a covered formulation resolves this.
• Plan-specific exclusion. Some plans explicitly exclude viscosupplementation. This is uncommon in current plan designs but does occur, particularly in some high-deductible and limited-benefit plans.

JRI Handles the Paperwork

At Joint Relief Institute, our insurance team manages the prior authorization process for you. We submit the required documentation, track the approval, and confirm coverage before your appointment. You do not need to navigate this process yourself.

What Will You Pay Out of Pocket?

Your actual out-of-pocket cost depends on your specific insurance situation:

With Medicare + Medigap Supplement

With Medicare Advantage

With Private Insurance

Without Insurance

For a comprehensive breakdown of costs across all scenarios, see our detailed guide on knee gel injection costs.

How JRI Handles Insurance Verification

At Joint Relief Institute, we have built our intake process around eliminating financial surprises. Here is what happens when you call to schedule:

Step 1: Insurance verification. Our team contacts your insurance company to confirm that viscosupplementation is covered under your specific plan, whether prior authorization is needed, and what your expected cost-share will be.

Step 2: Prior authorization (if required). If your insurer requires prior authorization, we handle the submission, follow up on the timeline, and confirm approval before scheduling your procedure.

Step 3: Cost estimate. Before your first visit, we provide a clear estimate of your expected out-of-pocket cost based on your verified benefits. No ambiguity.

Step 4: Treatment. Your injection is performed by an experienced physician using fluoroscopy guidance at one of our three locations: Orland Park, Oak Brook, or Glenview.

Step 5: Billing. We bill your insurance directly. Your responsibility is limited to the copay, coinsurance, or deductible amount we discussed before treatment.

This process exists because we believe patients should make treatment decisions based on their medical needs, not financial uncertainty. When you know exactly what you will pay before you walk in, the decision becomes purely about your health.

Tips to Maximize Your Coverage

A few practical strategies can help you get the most from your insurance coverage:

Get a referral if your plan requires one. HMO plans and some Medicare Advantage plans require a referral from your primary care physician. Arriving without one can result in denied coverage even if the procedure itself is covered. Confirm your plan’s referral requirements before scheduling.

Bring your imaging. If you have had knee X-rays taken by another provider, bring the images or have them sent to your treating physician. Having imaging readily available accelerates both the clinical evaluation and the insurance authorization process. If you do not have recent imaging, it can be obtained at your first visit.

Document your treatment history. If you have tried NSAIDs, physical therapy, cortisone injections, or other treatments, make sure this history is reflected in your medical records. Self-reported history can help, but documented treatment records carry more weight with insurers.

Ask about in-network status. Before scheduling with any provider, confirm they are in your insurance network. Out-of-network providers may be covered at a significantly reduced rate or not covered at all, depending on your plan type [7].

Time your treatment strategically. If you have a calendar-year deductible and have already met it through other medical expenses, scheduling gel injections in the same calendar year means you pay only your coinsurance or copay rather than also contributing to the deductible. Conversely, if you are close to meeting your out-of-pocket maximum, additional treatments in the same year may be fully covered.

Review your Explanation of Benefits (EOB). After treatment, review the EOB your insurance sends. If the amount billed, allowed, or patient-responsibility figures do not match what you were told, contact your provider’s billing department or your insurer to resolve discrepancies before paying.

Frequently Misunderstood Coverage Issues

”My doctor said insurance doesn’t cover gel injections.”

This statement is usually inaccurate. It may reflect a specific experience with one insurer or plan, or it may be outdated information. Medicare and the majority of private insurers cover viscosupplementation. The more precise statement would be: “some specific plans may not cover it, and coverage should be verified for each patient individually” [8].

”I was told I need to try cortisone first.”

Some insurers include a step-therapy requirement where cortisone injection must be attempted before gel injections are approved. This is a coverage policy, not a medical recommendation. If your insurer requires it, a single cortisone injection trial satisfies the requirement. Your physician can document the outcome and proceed to viscosupplementation authorization [5].

”My Medicare Advantage plan denied it.”

Medicare Advantage plans can impose prior authorization and utilization management rules that Original Medicare does not. A denial from a Medicare Advantage plan does not mean Medicare does not cover the treatment — it means that specific plan requires additional steps. An appeal with proper clinical documentation often reverses the denial [9].

”I was told I need to pay the full cost upfront.”

No patient at Joint Relief Institute is asked to pay the full cost of treatment without insurance verification first. If a provider tells you to pay cash upfront and “submit to insurance yourself,” consider that a warning sign about their billing practices.

Your Next Step

Insurance coverage should clarify your options, not complicate them. At Joint Relief Institute, we handle the verification, authorization, and billing so you can focus on the only question that matters: is this treatment right for your knee?

We accept most major insurance plans and Medicare. Our insurance team verifies your benefits and explains your costs before you commit to anything. Over 400,000 patients have trusted us to deliver precise, fluoroscopy-guided gel injections across our three Chicago-area locations.

Call (800) 238-9307 today to verify your coverage and schedule your evaluation at our Orland Park, Oak Brook, or Glenview location.

Learn more about viscosupplementation, the cost of knee gel injections, or explore whether knee gel injections are worth it.

Sources

1. Centers for Medicare & Medicaid Services. Medicare Benefit Policy Manual, Chapter 15: Covered Medical and Other Health Services. CMS.gov, 2025. https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/bp102c15.pdf

2. U.S. Food and Drug Administration. FDA-Approved Hyaluronic Acid Products for Intra-Articular Use. FDA.gov, 2024. https://www.fda.gov/medical-devices/premarket-notifications-510k

3. Centers for Medicare & Medicaid Services. Choosing a Medigap Policy: A Guide to Health Insurance for People with Medicare. Medicare.gov, 2026. https://www.medicare.gov/supplements-other-insurance/how-to-compare-medigap-policies

4. Centers for Medicare & Medicaid Services. Medicare Advantage Plans. Medicare.gov, 2026. https://www.medicare.gov/health-drug-plans/medicare-advantage-plans

5. American Academy of Orthopaedic Surgeons. Viscosupplementation Treatment for Arthritis. OrthoInfo, 2024. https://orthoinfo.aaos.org/en/treatment/viscosupplementation-treatment-for-arthritis/

6. American Medical Association. 2023 AMA Prior Authorization Physician Survey. AMA, 2023. https://www.ama-assn.org/system/files/prior-authorization-survey.pdf

7. Kaiser Family Foundation. Understanding Health Insurance: Key Terms and Common Questions. KFF, 2025. https://www.kff.org/health-reform/issue-brief/understanding-health-insurance/

8. Kolasinski SL, et al. 2019 American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee. Arthritis Care & Research, 2020;72(2):149-162. https://doi.org/10.1002/acr.24131

9. Centers for Medicare & Medicaid Services. Medicare Managed Care Appeals & Grievances. CMS.gov, 2025. https://www.cms.gov/medicare/appeals-grievances/managed-care