FDA product code · Physical medicine
Components, Wheelchair
FDA lists KNN as exempt from 510(k): a device of this type needs no clearance unless one of the limits in 21 CFR 890.9 applies, such as a new intended use or a different fundamental technology. 64 FDA decisions since 1977. 510(k) reviews decided 2021–2025 took a median of 256 days (half between 256 and 256). 3 recalls name this code, 0 of them Class I. The most-cited predicate is K863385, named by 1 later device.
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly Download the data (CSV)
Twenty years of KNN at a glance: how often FDA decides these devices, how long 510(k) reviews take, how often they are recalled, and how many adverse event reports name the code.
FDA decisions per year · KNN
1in 2022
2026 to Oct 25, outlined.
Median 510(k) review, days · KNN
Too few KNN 510(k)s in any year since 2007 to give a median.
Recalls per year · KNN
1in 2023
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · KNN
10in 2025
MAUDE reports naming product code KNN, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 0 | — | 0 | 3 |
| 2008 | 0 | — | 0 | 1 |
| 2009 | 0 | — | 0 | 1 |
| 2010 | 0 | — | 0 | 1 |
| 2011 | 0 | — | 0 | 1 |
| 2012 | 0 | — | 1 | 28 |
| 2013 | 0 | — | 0 | 77 |
| 2014 | 0 | — | 0 | 64 |
| 2015 | 0 | — | 0 | 4 |
| 2016 | 0 | — | 0 | 2 |
| 2017 | 0 | — | 0 | 3 |
| 2018 | 0 | — | 0 | 4 |
| 2019 | 0 | — | 0 | 2 |
| 2020 | 0 | — | 0 | 1 |
| 2021 | 0 | — | 0 | 16 |
| 2022 | 1 | — | 0 | 3 |
| 2023 | 0 | — | 1 | 2 |
| 2024 | 0 | — | 0 | 4 |
| 2025 | 0 | — | 0 | 10 |
| 2026 | 0 | — | 1 | — |
Planning a device in KNN? A 510(k) Report ranks candidate predicates in this code by lineage, citations and recall history, with the review-time outlook.
See the 510(k) ReportRelated product codes
Other codes under 21 CFR 890.3920.