Medicare covers a wide range of diabetes care across its four parts — hospital care under Part A, outpatient services and supplies under Part B, all-in-one Medicare Advantage under Part C, and prescription drugs under Part D. Major 2023 changes capped insulin at $35 per month for Part D, and a 2025 update added a $2,000 annual out-of-pocket cap on prescription drugs. This guide explains what is covered, what you pay, and which Medicare path makes sense for someone living with diabetes.
The Four Parts of Medicare for Diabetes
| Part | What It Covers | What You Pay in 2026 |
|---|---|---|
| Part A — Hospital | Inpatient hospital stays, skilled nursing for diabetes complications, hospice | $0 premium for most; $1,676 deductible per benefit period |
| Part B — Medical | Doctor visits, CGMs, pumps, test strips, DSMT, foot exams, eye exams | $185 monthly premium; $257 deductible; 20% coinsurance |
| Part C — Advantage | All of A and B bundled, usually with drug coverage and extras | Varies by plan; often $0 to $50 premium plus copays |
| Part D — Drugs | Injected insulin, oral diabetes meds, GLP-1s, syringes, pens | $0 to $100+ premium; deductible up to $590; $35 insulin cap; $2,000 annual cap |
Part B Outpatient Coverage in Detail
- Blood glucose monitors and test strips — covered as durable medical equipment with a prescription
- Continuous glucose monitors (CGMs) — Dexcom, Libre, and Eversense for insulin users or those with documented hypoglycemia
- Insulin pumps — Tandem, Omnipod, Medtronic for type 1 or type 2 diabetes meeting medical necessity criteria
- Diabetes Self-Management Training (DSMT) — 10 hours in the first year plus 2 hours each year thereafter
- Medical Nutrition Therapy (MNT) — 3 hours in the first year and 2 hours per year, provided by a registered dietitian
- Annual dilated eye exam for diabetic retinopathy screening
- Foot exams every 6 months for people with diabetic peripheral neuropathy
- Therapeutic shoes — one pair per year with three pairs of inserts if you have qualifying foot conditions
- A1C testing — typically every 3 to 6 months
- Cardiovascular disease screening, urine albumin testing for kidney disease
Part D and the $35 Insulin Cap
The Inflation Reduction Act of 2022 capped out-of-pocket costs for insulin at $35 per month for any insulin covered by a Medicare Part D plan, starting January 2023. The cap applies whether you are in the deductible phase, initial coverage, or any other phase of the benefit. Key points to know:
- The cap applies per insulin product per 30-day supply — if you use both a long-acting and a rapid-acting insulin, each is capped at $35
- It applies whether the insulin is in a vial, pen, or cartridge
- Insulin delivered through a Part B-covered pump is also capped at $35 per month under a parallel rule
- Your insulin must be on your plan’s formulary for the cap to apply — switch plans during Open Enrollment if your insulin is not covered
- U-200, U-300, and U-500 concentrated insulins are eligible if formulary-listed
The 2025 $2,000 Annual Out-of-Pocket Cap
Beginning in 2025 and continuing in 2026, Medicare Part D includes a hard $2,000 annual cap on what beneficiaries pay out of pocket for covered prescription drugs. For someone taking insulin plus a GLP-1 like Ozempic plus an SGLT2 inhibitor like Jardiance, this can save thousands of dollars per year compared to pre-2025 rules. Once the cap is hit, you pay $0 for the rest of the calendar year for covered drugs.
CGM Coverage Rules Since 2023
Medicare’s 2023 update broadened CGM access significantly. You qualify if any one of these is true:
- You use insulin (any frequency, any type of diabetes)
- You have a history of problematic hypoglycemia documented by your clinician — even without insulin
- You are training for or recovering from a procedure that warrants close glucose monitoring
You need a prescription, a confirmed diabetes diagnosis, and a clinician visit every 6 months (initially every 3 months for the first 6 months) to document continued use and benefit. The CGM transmitter, sensors, and (where applicable) receiver are all covered as durable medical equipment under Part B, with 20 percent coinsurance unless you have Medigap or Medicare Advantage absorbing it.
Insulin Pump Coverage Rules
Pumps are covered under Part B durable medical equipment. Eligibility requires:
- A diabetes diagnosis (typically type 1, though type 2 is increasingly covered with documentation)
- Evidence of multiple daily injections (at least 3 per day) before pump consideration
- Frequent self-monitoring of blood glucose (at least 4 times per day) before pump initiation
- A C-peptide test result indicating limited insulin production (for most type 2 approvals)
- Documentation that current regimen is inadequate to meet A1C goals
See our companion article on insulin pump insurance coverage for the full eligibility checklist.
Medicare Advantage vs Original Medicare for Diabetes
| Feature | Original Medicare + Part D + Medigap | Medicare Advantage |
|---|---|---|
| Provider network | Any doctor accepting Medicare nationwide | Plan network only (HMO) or with out-of-network costs (PPO) |
| Referrals | None needed | Often required for specialists |
| Prior authorization | Rare | Common — for CGMs, pumps, GLP-1s, brand drugs |
| Monthly premium | ~$185 (Part B) + $30 to $100 (Part D) + $100 to $300 (Medigap) | $0 to $200 per month all-in |
| Out-of-pocket max | None on A/B; $2,000 on Part D | Plan-set max, typically $4,000 to $8,000 |
| Dental/vision/hearing | Not covered (need separate policy) | Often included |
| Best for diabetes | Complex care, many specialists, brand-name drug needs | Predictable costs, fewer specialists, prefer one plan |
Medigap Supplement Plans
Medigap (Medicare Supplement Insurance) plans help pay the 20 percent coinsurance, deductibles, and copays that Original Medicare leaves you with. The most common plans for diabetes patients:
- Plan G — covers everything Medicare leaves except the Part B deductible ($257 in 2026); most comprehensive available to new enrollees
- Plan N — lower premium, small copays for office visits and ER, excess charges not covered
- High-Deductible Plan G — low premium, $2,800 deductible before Medigap pays
You can buy Medigap during your 6-month Initial Enrollment Period (when you turn 65 and have Part B) without medical underwriting. After that, insurers can deny you for diabetes in most states — Connecticut, Massachusetts, Maine, and New York have ongoing guaranteed-issue rules.
DSMT and Medical Nutrition Therapy
Two underused benefits worth claiming:
- DSMT (Diabetes Self-Management Training): 10 hours in your first year of training, then 2 hours every year after. Group or individual setting. Topics include glucose monitoring, healthy eating, physical activity, medication, and problem-solving. Order from a doctor; delivered by certified diabetes care and education specialists.
- MNT (Medical Nutrition Therapy): 3 hours in year one, 2 hours per year thereafter, delivered by a registered dietitian. Separate from DSMT — you can use both.
Read more about formal education programs in our DSMES guide.
Common Gaps and Workarounds
- Dental care — gum disease affects diabetes control. Add a standalone dental plan or look for Medicare Advantage with dental.
- Hearing aids — not covered by Original Medicare. Some Advantage plans include them.
- Routine vision — only the annual diabetic eye exam is covered. Glasses after cataract surgery are an exception.
- Weight-loss-only GLP-1s — Wegovy and Zepbound for weight loss alone are not covered; Ozempic and Mounjaro for diabetes are.
- Travel outside the US — limited coverage. Medigap C, D, F, G, M, N add foreign emergency coverage.
- Long-term custodial care — not covered. Medicaid or long-term care insurance bridges this gap.
How to Enroll and When to Switch
| Enrollment Window | When | What You Can Do |
|---|---|---|
| Initial Enrollment Period | 3 months before through 3 months after your 65th birthday | Enroll in A, B, D; buy Medigap without underwriting |
| Open Enrollment | October 15 to December 7 each year | Switch Part D plans, switch between Original and Advantage |
| Medicare Advantage Open Enrollment | January 1 to March 31 | Switch from one Advantage plan to another or to Original Medicare |
| Special Enrollment Period | Triggered by job loss, move, plan termination | Make changes outside other windows |
Cost-Lowering Strategies for Diabetes on Medicare
- Compare Part D plans every year — your insulin or GLP-1 may move tiers or off formulary
- Use mail-order pharmacy for 90-day supplies (often lower copay)
- Check Extra Help (Low-Income Subsidy) if income is under roughly $23,895 for individuals or $32,335 for couples in 2026
- Apply for state pharmaceutical assistance programs (varies by state)
- Manufacturer assistance is not available for Medicare beneficiaries on most diabetes drugs — see our manufacturer assistance guide for exceptions
- Compare GoodRx cash prices against your Part D copay — sometimes cash is cheaper for generics
- Walmart’s $25 ReliOn Novolin insulin remains a cash option (separate from Part D) for those between plans
Related Reading
For broader context on insurance and diabetes, see our guides to ACA Marketplace plans, CGM insurance coverage, and the $35 insulin price cap. Underlying disease basics are in our A1C levels guide.
The Bottom Line
Medicare covers most diabetes care for adults 65 and older or those with qualifying disabilities — Part A for hospitalization, Part B for outpatient supplies and education, and Part D for prescription drugs. The 2023 $35 insulin cap and 2025 $2,000 annual Part D out-of-pocket cap have meaningfully lowered diabetes costs. CGM and pump coverage expanded in 2023 to include type 2 patients on insulin or with hypoglycemia. The main choice is Original Medicare plus Part D and Medigap versus a Medicare Advantage plan that bundles everything — Original gives more flexibility and provider choice, Advantage gives predictable costs and extras like dental. Review your plan every Open Enrollment as drug formularies, premiums, and coverage rules change yearly. Talk to your doctor or a SHIP counselor about which combination fits your medications, providers, and budget.
