Reported Reactions

Devices › Sensor, glucose, invasive, non-adjunctive

Device brand name · Continuous glucose monitor

Dexcom G5 Continuous Glucose Monitoring System: medical device reports filed with FDA

205 reports name it, 2018–2022. Manufacturer given most often on reports: Dexcom. Product code PQF.

205
device reports naming the brand
0% of all MAUDE reports · about 25 a year
0
reports, 12 months to August 2026
0 in the 12 months before
99%
classified as malfunction
99.3% across the product code
0%
classified as death, as reported
0 reports · not verified by FDA

205 medical device reports received by FDA name the brand "Dexcom G5 Continuous Glucose Monitoring System" (continuous glucose monitor); the manufacturer given most often on reports is Dexcom; received from April 2018 to April 2022. Brand names are as the reporter or manufacturer wrote them, so one product can appear under several spellings.

0 reports arrived in the 12 months to August 2026, and none in the 12 months before. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases. The event types recorded are malfunction (99%) and injury (1%); across all sensor, glucose, invasive, non-adjunctive reports (product code PQF) death is recorded in 0% and malfunction in 99.3%. Event type is the reporter's classification of the report, not a verified outcome.

The device problems coded most often are no device output (42%), wireless communication problem (31.7%) and connection problem (8.3%). The patient problems coded most often are complaint, ill-defined, erythema and fever. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Reports by month, five years

062124Sep 2021: 0Oct 2021: 0Nov 2021: 0Dec 2021: 02022Jan 2022: 4Feb 2022: 124Mar 2022: 37Apr 2022: 3May 2022: 0Jun 2022: 0Jul 2022: 0Aug 2022: 0Sep 2022: 0Oct 2022: 0Nov 2022: 0Dec 2022: 02023Jan 2023: 0Feb 2023: 0Mar 2023: 0Apr 2023: 0May 2023: 0Jun 2023: 0Jul 2023: 0Aug 2023: 0Sep 2023: 0Oct 2023: 0Nov 2023: 0Dec 2023: 02024Jan 2024: 0Feb 2024: 0Mar 2024: 0Apr 2024: 0May 2024: 0Jun 2024: 0Jul 2024: 0Aug 2024: 0Sep 2024: 0Oct 2024: 0Nov 2024: 0Dec 2024: 02025Jan 2025: 0Feb 2025: 0Mar 2025: 0Apr 2025: 0May 2025: 0Jun 2025: 0Jul 2025: 0Aug 2025: 0Sep 2025: 0Oct 2025: 0Nov 2025: 0Dec 2025: 02026Jan 2026: 0Feb 2026: 0Mar 2026: 0Apr 2026: 0May 2026: 0Jun 2026: 0Jul 2026: 0Aug 2026: 0

Reports by the month FDA received them. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.

By year received

0841682018: 2920182019: 820192022: 1682022

Event type and report source

Event type, as classified on the report

Death0%0
Injury1%2
Malfunction99%203
Other0%0
Not given0%0

Who filed the report

Manufacturer report99.5%204
Voluntary report0.5%1
User facility report0%0
Distributor report0%0
Not given0%0

Grey bar: all 325,941 reports carrying product code PQF. Event type is the filer's classification and is not verified by FDA.

Device problems coded

Device problem (FDA code)ReportsShareShare across product code
No device output8642%7.7%
Wireless communication problema wireless connection problem6531.7%52.3%
Connection problema connection problem178.3%0.5%
Imprecision157.3%15.8%
Detachment of device or device componentpart of the device came off42%0.9%
Failure to sense31.5%0%
Inappropriate or unexpected reset10.5%1.1%
Invalid sensing10.5%2.1%

FDA's device problem codes as entered on the report; one report can carry several. Generic codes such as "no apparent adverse event" are left out.

Patient problems coded

Patient problem (FDA code)ReportsShare
Complaint, ill-defined10.5%
Erythemaskin redness10.5%
Fever10.5%
Itching sensation10.5%
Rashskin rash10.5%
Skin infection10.5%
Skin inflammation/ irritation10.5%

Patient problem codes are present mainly in reports filed since 2019 and are often blank.

In context

MeasureDexcom G5 Continuous Glucose Monitoring SystemProduct code PQFAll MAUDE reports
Reports205325,94126,136,888
Share of that pool—0.1%0%
Classified as death, per 1,000 reports009
Classified as injury1%0.7%36.2%
Classified as malfunction99%99.3%62.3%
Filed by the manufacturer99.5%100%94.9%

Shares are of reports, not of devices in use. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."

Other brands with product code PQF

BrandReportsLatest 12 monthsClassified as death
Dexcom G5 Mobile Continuous Glucose Monitoring System332,49260%
Transmitter Mmt-7841zn Gst5g Us42,01314,1860%
Transmitter Mmt-7841zw Gst5g Ous31,57212,3510%
Sensor Mmt-5120c Instinct 780 5pk Ous 12,9421,6810%
Sensor Mmt-5120d1 Instinct 780 1pk Ous 12,8301,7530%
Transmitter Mmt-7841qzw Gst5g Ous Lckout1,6321870%
Sensor Mmt-5100jd1 Simplera 1pk Ous11,3567750%
Sensor Mmt-5100jc1 Simplera 5pk Ous11,1077130%
Sensor Mmt-5120d2 Instinct 780 1pk Ous 21,7871,0620%
Dexcom G6 Continuous Glucose Monitoring System1,339,56261,7100%
Dexcom G5 Mobile Continuous Glucose Monitoring49000%
Sensor Mmt-5100jd2 Simplera 1pk Ous23692390%
Sensor Mmt-5100jd3 Simplera 1pk Ous33221960%
SFTWR MMT-8400 CGM Module iOS3101370%
Xmtr Kit Mmt-7840w1 Grdn 4 9l W2931800%

Ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA also states that "common products may have a higher number of adverse events due to the higher total number of people using the product."

Questions about Dexcom G5 Continuous Glucose Monitoring System reports

How many FDA reports name Dexcom G5 Continuous Glucose Monitoring System?

205 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 0 in the latest 12 months.

What kinds of events are reported?

malfunction (99%) and injury (1%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.

What device problems are coded?

no device output (42%), wireless communication problem (31.7%), connection problem (8.3%), imprecision (7.3%) and detachment of device or device component (2%). These are FDA's device problem codes as entered on the report.

Who files these reports?

manufacturer reports (99.5%) and voluntary reports (0.5%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.

Do these reports show that Dexcom G5 Continuous Glucose Monitoring System was at fault?

No. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA adds that "a causal relationship cannot be established between product and reactions listed in a report."

How do I report a problem with a medical device?

Through FDA MedWatch (Form FDA 3500 for health professionals and consumers), or to the manufacturer. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Device Adverse Event (MAUDE) bulk export released 28 Sep 2026, which holds reports FDA received through 31 Aug 2026. Brand, generic and manufacturer names are as written on the reports; product code names come from FDA's device classification. A report counts here when any device it lists carries this brand name after punctuation and capitalisation are normalised. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.