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FreeStyle Libre CGM facts, specs and Medicare notes

Abbott's FreeStyle Libre 3 Plus and Libre 2 Plus sensors: 15-day wear, warm-up, ages, readers and MRI notes from Abbott's own pages.

Written by PlanScout teamReviewed by PlanScout Internal Review TeamLast reviewed Oct 25, 20265 sourcesHow we make money
  • Abbott makes the FreeStyle Libre sensors. The Plus sensors are worn for 15 days.[1]
  • Each system has a phone app and a handheld reader you can use instead.[2],[3]

FreeStyle Libre 3 Plus

Continuous glucose monitor

Wear time15 days[1]
Warm-up60 minutes[2]
Ages2 and older[1]
ReadingsSent to your phone every minute, or to the Libre 3 reader[2]
Where wornBack of the upper arm only[1]
Insulin pumpsCan connect to some automated insulin systems[1]

FreeStyle Libre 2 Plus

Continuous glucose monitor

Wear time15 days[1]
Warm-up60 minutes[3]
Ages2 and older[1]
ReadingsLibre app or the Libre 2 reader[3]

Medicare notes

  • The same Medicare rules apply to every brand. The device must be used within its approved ages and uses.[4]
  • To keep supplies covered, use the Libre reader at least some of the time, not only the phone.[5]

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Good to know

  • The older Libre 3 sensor is worn 14 days and is for ages 4 and up.[1]
  • With a Libre 3 sensor, taking more than 500 mg of vitamin C a day may affect readings.[1]
  • Abbott says Libre sensors can stay on during some MRI exams if set conditions are followed. Leave the phone and reader outside the room.[1]

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Reviewed & sourced

Reviewer
PlanScout Internal Review Team. Checks facts and plain-English accuracy; has no say in how results are ordered.
What was checked
Owner sign-off for the PlanScout Internal Review Team: Medicare coverage rules, costs and brand facts against the cited sources
Last reviewed
Oct 25, 2026
Next review
Before Jan 1, 2027 (new plan year), or sooner if Medicare changes a rule.
Corrections
See something wrong? Tell us. We fix confirmed errors within 2 business days and note the change in the page's change log.
Change log
  • Oct 25, 2026: First published and reviewed.
Sources (5)
  1. Abbott: FreeStyle Libre important safety information (retrieved Oct 25, 2026)
  2. Abbott: FreeStyle Libre 3 system (retrieved Oct 25, 2026)
  3. Abbott: FreeStyle Libre 2 system (retrieved Oct 25, 2026)
  4. Medicare Coverage Database: Glucose Monitors, LCD L33822 (revision effective 10/01/2024) (retrieved Oct 25, 2026)
  5. Medicare Coverage Database: Glucose Monitor Policy Article A52464 (revision effective 02/18/2025) (retrieved Oct 25, 2026)