Insurance Denied My Diabetes Supplies or Insulin — What to Do

Managing diabetes is relentless. The monitoring, the calculations, the daily decisions — and the constant cost of the supplies and medications that keep you alive. When your insurance denies your insulin, your continuous glucose monitor, your insulin pump, or your test strips, it's not just frustrating. It can be dangerous.

Diabetes supply and medication denials are common, but they are among the most successfully challenged insurance denials — because the medical necessity of these items is undeniable. Here's how to fight back.

Common Diabetes-Related Insurance Denials

Insulin denied or placed at high tier

Insulin is a life-sustaining medication. Despite this obvious necessity, insurers routinely deny specific insulin types or place them in high cost-sharing tiers that make them unaffordable. The most common reason: the specific insulin isn't on your plan's formulary, or a generic/biosimilar alternative is preferred.

Note: Under federal law passed in 2024, Medicare Part D caps insulin cost-sharing at $35 per month. For commercial insurance, manufacturer copay programs and patient assistance programs may provide immediate help while you appeal.

Continuous Glucose Monitor (CGM) denied

CGMs — devices like Dexterity G7, Libre, and others — provide real-time glucose monitoring without fingersticks. They dramatically improve diabetes management and reduce serious complications like hypoglycemia. Yet insurers frequently deny them as "not medically necessary," or limit them to patients with Type 1 diabetes, or require Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization that gets denied.

Insulin pump denied

Insulin pumps provide continuous subcutaneous insulin infusion and can dramatically improve glucose control. Denials often cite "not medically necessary" or require that the patient meet specific criteria (number of daily injections, A1C levels, demonstrated need).

Test strips and monitoring supplies denied or quantity-limited

Test strips are the basics of diabetes management for patients not on CGMs. Insurers sometimes deny claims for exceeding quantity limits, even when a patient's medical situation requires more frequent monitoring.

Your Step-by-Step Appeal Plan

Step 1: Understand the specific denial reason

Read your denial letter. Is this a formulary issue (drug not covered), a tier issue (covered but expensive), a prior authorization denial, or a medical necessity denial? Each requires a slightly different approach.

Step 2: Get your endocrinologist or diabetes care team involved immediately

Your diabetes care provider is your most important resource. Ask them to provide:

• A letter of medical necessity for the specific denied item, including:
  • Your diabetes diagnosis and type
  • Your current treatment regimen
  • Clinical reasons why this specific device, medication, or supply is necessary
  • Why alternatives aren't appropriate (if applicable)
  • Documentation of past experiences with alternatives if relevant
  • The clinical risks of managing without this item

For CGM appeals specifically, your provider should document:

• Episodes of hypoglycemia (documented)
• Your A1C history and management challenges
• How the CGM will improve glucose management and reduce dangerous episodes
• Reference to clinical guidelines supporting CGM use (ADA Standards of Care are excellent here — the American Diabetes Association explicitly recommends CGMs as standard of care for many patients)

For insulin pump appeals, your provider should document:

• Why multiple daily injections are insufficient for your management
• Your treatment history and challenges with achieving glycemic control
• Clinical criteria your plan requires and how you meet them

Step 3: Cite the American Diabetes Association Standards of Care

The ADA publishes annual Standards of Medical Care in Diabetes, which are the gold standard clinical guidelines. If the ADA guidelines recommend your denied supply or medication for patients with your specific profile, cite them explicitly. These guidelines carry significant weight with insurance reviewers and External Independent Review: Complete Guide" class="auto-link">external reviewers.

Step 4: For formulary denials — request a formulary exception

Most plans have a process for requesting a "formulary exception" — asking the plan to cover a non-formulary drug based on medical necessity. This is separate from the standard appeal process and may be faster. Your doctor must document why the formulary alternative(s) are not appropriate for your medical needs.

Common reasons include: prior adverse reaction to the formulary alternative, drug interactions, demonstrated inadequate control on the formulary drug, or physician clinical judgment that the non-formulary drug is the appropriate choice.

Step 5: Apply for manufacturer assistance immediately

While your appeal is in progress:

• Insulin manufacturers (Eli Lilly, Novo Nordisk, Sanofi) all have patient assistance programs offering insulin at significantly reduced cost or free
• CGM manufacturers (Dexcom, Abbott) have copay assistance and access programs
• Insulin pump companies have patient assistance and upgrade assistance programs

These don't replace your appeal, but they may let you maintain your care while the appeal process plays out.

Step 6: File your formal appeal

Submit a complete appeal package including:

• Your doctor's letter of medical necessity
• Relevant medical records (glucose logs, A1C history, documented hypoglycemic events)
• Clinical guidelines supporting your treatment
• A personal statement describing the impact of the denial on your daily management and health

Step 7: Escalate to external review and state resources

If your internal appeal is denied, request external review. CGM and insulin pump denials that come with strong clinical documentation from an endocrinologist are frequently overturned at external review.

Your state insurance commissioner may also have resources for patients denied essential medical supplies.

Living With Diabetes Is Hard Enough

You manage a complex medical condition every single day. The last thing you should have to do is fight your insurance company for access to medications and devices that keep you healthy.

But you may have to fight. And when you do — with the right documentation and the right arguments — you have an excellent chance of winning.

Fight Back With ClaimBack

ClaimBack helps diabetes patients build compelling appeals for denied supplies, devices, and medications. Start today.

Start your appeal at https://claimback.app/appeal

Your diabetes management is non-negotiable. Fight for what you need.

Related Reading

• What Is Medical Necessity and How Does It Affect Your Claim?
• How to Write an Insurance Appeal Letter
• Common Reasons Insurance Claims Are Denied