Diabetes & Medicare Supply Glossary

Plain-English definitions for every term you'll encounter when managing diabetes or navigating Medicare coverage for diabetic supplies — from A1C to ZIP code delivery.

A

A1C: A blood test measuring average blood sugar over the past 2–3 months.
A1C Home Test: An over-the-counter test that measures A1C from a fingerstick blood sample at home, without a lab visit.
Assignment: Agreement by a Medicare supplier to accept the Medicare-approved amount as payment in full — protecting patients from excess charges.
Alcohol Swabs: Sterile wipes used to clean injection sites, infusion set sites, and fingertips before glucose testing.
Accu-Chek Guide: Roche's flagship blood glucose meter featuring a spill-resistant test strip vial and high accuracy.
Ambulatory Glucose Profile: A standardized CGM data visualization that compresses days of glucose readings into a single overlay report — the clinical standard for CGM review.
AHCCCS: Arizona's Medicaid program — the state health insurance program for lower-income Arizona residents, including those who are dual-eligible for both AHCCCS and Medicare.

B

Blood Glucose: The concentration of glucose (sugar) in your bloodstream, measured in mg/dL.
Basal Rate: The continuous low-level insulin delivery programmed into an insulin pump to cover background glucose production.
Bolus: A larger dose of rapid-acting insulin delivered on demand to cover a meal or correct a high blood glucose.
BD Ultra-Fine: Becton Dickinson's pen needle line — the BD Nano 4mm 32G is one of the most widely recommended injection technique standards.

C

CGM: A wearable sensor that measures glucose in interstitial fluid every 1–5 minutes, continuously.
Certificate of Medical Necessity: A form completed by your physician certifying that a piece of DME is medically necessary for Medicare billing.
Closed-Loop System: An insulin pump + CGM system that automatically adjusts insulin delivery in real time based on sensor glucose readings.
Compression Socks: Medical-grade socks that apply graduated pressure to the lower leg to improve circulation and reduce swelling.
Carbohydrate Counting: A meal planning technique where grams of carbohydrate are tracked to calculate appropriate insulin doses.
Contour Next: Ascensia Diabetes Care's highly accurate blood glucose meter — consistently rates among the top performers in independent accuracy studies.
C-Peptide: A lab marker of the body's own insulin production — used as a Medicare documentation requirement for insulin pump coverage.
Continuous Subcutaneous Insulin Infusion: See Insulin Pump — the clinical term for pump-based insulin delivery directly into the subcutaneous tissue.
Coinsurance: The percentage of a Medicare-approved cost that the beneficiary pays after the deductible — typically 20% under Part B.
Coverage Gap: A phase in Medicare Part D drug coverage where cost-sharing increases — reduced significantly since 2024 under the Inflation Reduction Act.
Control-IQ Technology: Tandem's automated insulin delivery algorithm for the t:slim X2 pump — automatically adjusts basal rates and delivers correction boluses based on CGM.

D

DME: Medical equipment designed for repeated use that serves a medical purpose — the Medicare category covering diabetic supplies.
Diabetic Neuropathy: Nerve damage caused by prolonged high blood glucose — most commonly affecting the feet and legs.
Diabetic Retinopathy: Damage to the blood vessels of the retina caused by chronic high blood glucose — a leading cause of blindness in adults.
Diabetic Nephropathy: Progressive kidney damage caused by diabetes — the leading cause of kidney failure in the United States.
Diabetic Foot Ulcer: An open sore or wound on the foot caused by neuropathy and poor circulation — a major cause of hospitalization in people with diabetes.
DKA: A life-threatening complication of diabetes where the body produces excess blood acids (ketones) due to severe insulin deficiency.
Dexcom G7: Dexcom's current flagship continuous glucose monitor — a 10-day all-in-one sensor/transmitter worn on the upper arm or abdomen.
Diabetic Socks: Specially designed socks with no seams, non-binding tops, and moisture-wicking fabric to protect insensate diabetic feet.
Dawn Phenomenon: A natural early-morning rise in blood glucose caused by hormones released around 4–8 AM that increase insulin resistance.
Diabetic Ketoacidosis: See DKA — a life-threatening complication where insufficient insulin causes the body to produce dangerous levels of ketones.
Diabetic Retinopathy: See Retinopathy — damage to the eye's retina from chronic high blood glucose, a leading cause of adult blindness.
Diabetes Self-Management Education: Structured education programs that teach people with diabetes to manage their condition — covered by Medicare Part B.
Diabetic Skin Care: Moisturizers, barrier creams, and antifungal products formulated for the skin care needs of people with diabetes.
Diabetic Nutrition: Nutritional strategies tailored to diabetes management — ranging from carbohydrate counting to medical nutrition therapy.
DMEPOS: Durable Medical Equipment, Prosthetics, Orthotics, and Supplies — the Medicare supplier category for diabetic DME companies.
Diabetic Inserts: Pressure-redistributing insoles placed inside therapeutic shoes to protect diabetic feet from ulcer-causing pressure points.
Diabetic Shoe Benefit: Medicare Part B's annual benefit covering one pair of therapeutic shoes and three pairs of inserts for qualifying diabetic patients.

E

Eversense E3: Senseonics' implantable CGM sensor that lasts 6 months under the skin — the only long-term implantable CGM available in the U.S.

F

FreeStyle Libre 3: Abbott's current continuous glucose monitor — a small coin-sized sensor worn on the back of the upper arm for 14 days.
Fasting Blood Glucose: Blood glucose measured after at least 8 hours of fasting — a standard diagnostic test for diabetes.
Formulary: The list of drugs covered by a Medicare Part D or Advantage plan, organized into cost tiers.
FlexPen: Novo Nordisk's disposable prefilled insulin pen — one of the most widely prescribed insulin delivery devices.

G

Glucagon: A hormone that rapidly raises blood glucose — used as an emergency treatment for severe hypoglycemia.
Glucose Meter: A handheld device that measures blood glucose from a fingerstick blood sample applied to a test strip.
Gestational Diabetes: Diabetes that develops during pregnancy — usually resolves after delivery but significantly increases risk of Type 2 diabetes later.

H

Hyperglycemia: Blood glucose above normal ranges — fasting above 130 mg/dL or post-meal above 180 mg/dL in people with diabetes.
Hypoglycemia: Blood glucose below 70 mg/dL — a potentially dangerous condition requiring prompt treatment.

I

Insulin Pump: A programmable device that delivers a continuous basal dose of insulin plus user-triggered bolus doses.
Insulin: A hormone that allows cells to take up glucose from the bloodstream — administered by injection or pump in diabetes treatment.
Interstitial Glucose: Glucose concentration in the fluid between cells — what CGM sensors actually measure, which lags blood glucose by 5–10 minutes.
Insulin-to-Carb Ratio: How many grams of carbohydrate one unit of rapid-acting insulin covers — used to calculate meal bolus doses.
Infusion Set: The tubing and cannula that connects a traditional insulin pump to the body, replaced every 2–3 days.
Insulin Syringes: Single-use syringes calibrated for insulin concentration (U-100 or U-500) used for vial-and-syringe insulin injection.
Insulin Cooling Case: An insulated or evaporative cooling case that keeps insulin at safe temperatures without refrigeration.

K

Ketones: Acidic byproducts produced when the body burns fat for energy due to insufficient insulin.
Ketone Meter: A meter that measures blood ketone levels — used to detect DKA risk in insulin-using patients, especially pump users.

L

Lancet: A small, sterile needle used to prick the fingertip (or alternate site) to produce a blood drop for glucose testing.
Lipohypertrophy: Fatty lumps under the skin that develop from repeated insulin injections or infusion sets at the same site.

M

Medicare Part B: The Medicare component that covers outpatient medical services and durable medical equipment — the pathway for most diabetic supply coverage.
Medicare Part D: The Medicare prescription drug benefit — covers insulin and many diabetes medications, separate from the DME covered under Part B.
Medicare Advantage: An alternative to Original Medicare offered by private insurers that must cover everything Part A and B covers, often with extra benefits.
Medigap: Private insurance that covers Medicare's cost-sharing gaps — typically pays the 20% Part B coinsurance for DME and services.
Medical Alert ID: Jewelry or a card identifying a person as having diabetes and/or being insulin-dependent — critical for emergency response.
Mobility Aid: DME that assists with walking or mobility — often needed by people with diabetic complications affecting the legs and feet.
Medtronic MiniMed 780G: Medtronic's advanced closed-loop insulin pump system with automatic correction boluses — targets 100 mg/dL.
Medicare Open Enrollment: October 15–December 7 each year — the window to change Medicare Advantage or Part D drug plans for the following year.

N

Nebulizer: A device that converts liquid medication into a fine mist for inhalation — commonly used for asthma and COPD that often co-exist with diabetes.
NovoFine Plus: Novo Nordisk's pen needles, designed for use with Novo Nordisk insulin pens (FlexPen, FlexTouch, NovoPen).

O

Omnipod 5: A tubeless, waterproof insulin pump by Insulet that adheres directly to the skin and requires no infusion set tubing.
OTC Allowance: A periodic credit offered by some Medicare Advantage plans to spend on approved over-the-counter health products.
OneTouch Ultra: LifeScan's OneTouch line of blood glucose meters — one of the most recognized brands in diabetes monitoring.

P

Prior Authorization: Insurer approval required before certain expensive supplies or medications are covered.
Pen Needles: Disposable needles that attach to insulin pens for subcutaneous injection.
Peripheral Artery Disease: Narrowing of arteries in the legs due to atherosclerosis — common in diabetes and a major risk factor for foot ulcers and amputation.
Peripheral Neuropathy: See Diabetic Neuropathy — nerve damage primarily affecting the feet, legs, and hands.
Preauthorization: See Prior Authorization — the process of obtaining insurer approval before receiving certain supplies or services.
Prediabetes: Blood glucose levels above normal but below the diabetes threshold — affecting 96 million American adults.
Phoenix Metro Medicare Coverage: Medicare coverage options and statistics for the Phoenix metropolitan area — one of the highest concentrations of Medicare beneficiaries in the U.S.

R

ReliOn: Walmart's store brand blood glucose meter — an affordable cash-pay option, though not typically reimbursable through Medicare Part B.

S

Self-Monitoring of Blood Glucose: The practice of testing your own blood glucose using a meter and test strips — a foundational skill in diabetes self-management.
Smart Insulin Pen: An insulin pen with built-in Bluetooth and dose-tracking software that logs injections and guides bolus calculations.

T

Test Strips: Disposable strips that react with a blood drop to generate a glucose reading on a meter.
Therapeutic Shoes: Specially designed footwear for people with diabetes that reduces pressure points and ulcer risk.
Time in Range: The percentage of time blood glucose stays between 70–180 mg/dL — a key CGM metric that captures glucose control better than A1C alone.
Tandem t:slim X2: Tandem Diabetes Care's touchscreen insulin pump with Control-IQ automated insulin delivery technology.
Type 1 Diabetes: An autoimmune condition where the pancreas produces little or no insulin — requiring lifelong insulin therapy.
Type 2 Diabetes: The most common form of diabetes — caused by insulin resistance and progressive decline in pancreatic insulin production.
TRUE Metrix: Trividia Health's value-focused blood glucose meter — often covered under Medicare Part B as an alternative meter option.