Quick Answer
Yes, Medicare Part B covers Gel-One injections for knee osteoarthritis when medical necessity criteria are met. Gel-One is a cross-linked hyaluronic acid product by Zimmer Biomet, now given as a single injection. Most patients pay 20% coinsurance after meeting their Part B deductible.
Medicare Part B Coverage for Gel-One
Gel-One is a cross-linked sodium hyaluronate injection manufactured by Zimmer Biomet. Originally approved as a three-injection series, Gel-One’s labeling was updated to allow a single injection, making it more convenient for patients. Medicare covers Gel-One under Part B (the medical benefit) because it is administered in a physician’s office or outpatient facility.
Key coverage facts:
- Covered under Part B as a physician-administered injectable
- No prior authorization required under Original Medicare
- Subject to Local Coverage Determinations (LCDs) from your regional MAC
- Must meet medical necessity criteria documented in your medical records
- Updated to single injection — label change in 2023 allows one-injection treatment
Coverage Requirements
Medical Necessity Criteria
For Medicare to pay for Gel-One, your medical records must show:
- Diagnosis of knee osteoarthritis with ICD-10 code M17.x
- Failure of conservative treatment for at least 3 months, including physical therapy, NSAIDs, or activity modification
- Chart documentation showing those conservative methods were not sufficient
- X-ray evidence confirming osteoarthritis (most MACs require imaging within the past 12 months)
Billing Codes
| Code | Description | 2026 Estimated Allowable |
|---|---|---|
| J7326 | Gel-One (sodium hyaluronate), per dose | $500 - $700 |
| 20610 | Arthrocentesis, large joint (knee) | $85 - $110 |
| 77002 | Fluoroscopic guidance (if used) | $75 - $95 |
Your provider bills Medicare using J-code J7326 for Gel-One. With the current single-injection labeling, this code is billed once per treatment course.
Frequency Limits
- Medicare typically covers one Gel-One injection per knee every 6 months
- Some MACs allow repeat treatment after 6 months if the prior injection gave meaningful relief
- Bilateral knee treatment is generally covered when both knees have documented OA
- Your provider should document the clinical outcome from previous treatment to justify repeat courses
Your Out-of-Pocket Costs
| Item | Amount |
|---|---|
| Part B deductible (2026) | $257/year |
| Coinsurance | 20% of Medicare-approved amount |
| Typical total patient cost | $100 - $160 per injection |
| With Medigap | May cover the 20% coinsurance |
Example Cost Calculation
If Medicare approves $600 for a Gel-One injection:
- Medicare pays: $480 (80%)
- You pay: $120 (20%)
- If you have a Medigap plan: your supplement may cover some or all of that $120
Medicare Advantage Plans
If you have a Medicare Advantage (Part C) plan:
- Coverage generally follows Original Medicare guidelines
- Prior authorization may be required — check with your plan before your appointment
- Copays vary by plan and may differ from the standard 20% coinsurance
- Network restrictions may apply — confirm your provider is in-network
- Contact your plan’s member services to verify coverage before treatment
What If Medicare Denies Coverage?
If your Gel-One claim is denied:
- Request the denial reason in writing
- Gather supporting documents including X-rays, treatment records, and your provider’s letter of medical necessity
- File a redetermination (Level 1 appeal) within 120 days
- Include clinical evidence showing Gel-One is medically appropriate for your condition
Many initial denials are overturned on appeal with proper documentation.
Gel-One Product Details
| Feature | Detail |
|---|---|
| Manufacturer | Zimmer Biomet |
| Active ingredient | Cross-linked sodium hyaluronate |
| Injection schedule | 1 injection per treatment course (updated label) |
| FDA-approved for | Knee osteoarthritis |
| Molecular weight | High (cross-linked for extended residence time) |
| Source | Avian-derived (chicken comb extract) |
| Volume per injection | 3 mL |
Gel-One uses a cross-linking process that creates a more durable gel structure. This allows the hyaluronic acid to remain in the joint longer than non-cross-linked products. The 2023 label update consolidating it to a single injection made Gel-One more competitive with other single-injection products on the market.
Frequently Asked Questions
How often will Medicare pay for Gel-One?
Medicare generally covers one Gel-One injection per knee every 6 months. Your provider must document that the treatment is medically necessary and that prior injections provided clinical benefit.
Do I need prior authorization for Gel-One under Medicare?
No. Original Medicare does not require prior authorization for Gel-One. Medicare Advantage plans may have their own prior authorization requirements. Check with your specific plan before scheduling.
Is Gel-One covered under Medicare Advantage?
Yes. Medicare Advantage plans must cover everything Original Medicare covers. However, cost-sharing, network requirements, and prior authorization rules may differ. Contact your plan for details.
Was Gel-One always a single injection?
No. Gel-One was originally approved as a three-injection series. The labeling was updated in 2023 to allow a single-injection treatment course. Your provider may still use the three-injection approach if they believe it is more appropriate for your condition, and Medicare should cover both approaches.
How does Gel-One compare to other single-injection HA products?
Gel-One, Synvisc-One, Monovisc, and Durolane are all single-injection viscosupplements. Each uses a different formulation and cross-linking method. Medicare covers all of them. Your provider can help determine which product is best for your situation.