Diabetes on Medicare: the whole stack, from $35 insulin to free prevention

Insulin: $35, everywhere, no deductible

Federal law caps insulin at $35 for a month’s supply on every Part D plan, every covered insulin, with the deductible bypassed, and the same cap applies to insulin used in Part B-covered pumps. The cap is per insulin, so two insulins mean up to $70. What the cap doesn’t do: force every plan to carry every brand, so formulary checking in the fall re-shop still matters, and switching to a covered biosimilar when your brand is off-formulary is often the clean solve. Insulin spending also counts toward the $2,100 cap, pulling heavy users toward the annual ceiling faster.

CGMs and pumps: the Part B lane

Continuous glucose monitors (Dexcom, Libre, and kin) are covered as Part B durable medical equipment for people who use insulin, and for some non-insulin users with documented problematic hypoglycemia: 80/20 after the deductible, with Medigap absorbing the 20% and Advantage plans applying their DME cost-sharing. Insulin pumps ride the same lane with clinical criteria attached. Two practical notes: supplies (sensors, transmitters) recur monthly and add up at 20%, which quietly favors the supplement path for CGM users on Original Medicare; and suppliers must be Medicare-enrolled, with pharmacy counters increasingly handling CGM billing directly.

Strips, lancets, meters

Classic self-testing supplies are Part B DME: meters, strips, lancets, control solutions, at 80/20, with standard covered quantities (higher for insulin users) and a doctor’s order establishing testing frequency. Exceeding the standard quantities is coverable with documentation of medical need. The everyday failure mode is a pharmacy billing strips to Part D (copays apply) instead of Part B; if your strip costs look wrong, that one-word billing question, "is this going through Part B?", is usually the fix.

The other drugs

Everything non-insulin, metformin, SGLT2 inhibitors, sulfonylureas, and GLP-1s prescribed for diabetes (Ozempic, Mounjaro), runs through Part D normally: plan formularies, tiers, and the $2,100 cap, with several diabetes drugs on the federal negotiation list bringing prices down. The distinction that confuses everyone: GLP-1s for weight loss route through the separate Bridge program at $50 a month, outside Part D; the same molecule’s path depends on the diagnosis on the prescription.

The free layer

• Diabetes screenings at $0 for people with risk factors, up to twice yearly with prediabetes.
• The Medicare Diabetes Prevention Program: a free, structured year-long lifestyle program for people with prediabetes who meet criteria, the rare benefit that pays you attention before the diagnosis.
• Medical nutrition therapy with a registered dietitian, covered for diabetes (and kidney disease) with a referral, at $0 for the service.
• Diabetes self-management training: covered structured education, ten initial hours plus annual follow-ups, chronically underused.

Feet and eyes: the covered exceptions

Two carve-outs from Medicare’s usual exclusions exist specifically for diabetes: an annual diabetic eye exam (dilated retinopathy screening, distinct from the excluded routine vision exam), and foot care: routine podiatry that’s otherwise excluded becomes covered with diabetic peripheral neuropathy, plus therapeutic shoes or inserts annually with the qualifying diagnosis and paperwork. Both exist because prevention here is cheaper than amputation and blindness, a rare instance of the statute doing arithmetic; use them on schedule via the wellness visit’s prevention plan.

Questions people also ask

Sources for this article

• Medicare.govIs my test, item, or service covered?: each diabetes benefit’s rules.
• Medicare.govPart D costs: the $35 insulin cap and drug coverage.
• CMS.gov2026 premiums and deductibles: the Part B structure behind DME and CGM coverage.

Figures checked against these sources in August 2026. We update within weeks when CMS publishes new amounts.