A 510(k) clearance is the FDA’s green light for a medical device manufacturer to sell a new product in the United States, based on showing that the device is substantially equivalent to one already on the market. It’s the most common pathway medical devices take to reach consumers. The name comes from Section 510(k) of the Federal Food, Drug, and Cosmetic Act, which requires manufacturers to notify the FDA at least 90 days before bringing a device to market.
How 510(k) Clearance Works
The core idea behind a 510(k) is comparison. Rather than proving a device is safe and effective from scratch, the manufacturer identifies a “predicate device,” something already legally sold, and demonstrates that the new device is substantially equivalent to it. This comparison covers intended use, design, materials, energy source, performance, safety, and labeling, among other characteristics.
Substantial equivalence does not mean identical. A new blood pressure monitor, for example, might use different internal components or a different display than its predicate, but if it measures blood pressure the same way, for the same purpose, and performs comparably, it can qualify. The manufacturer must identify a primary predicate device that is most similar in both its intended use and its technological characteristics.
This system exists because of a practical problem the FDA faced in 1976. When Congress gave the agency authority over medical devices, thousands were already being sold. Those devices were “grandfathered” in, and the 510(k) process was created so new devices could enter the market by proving they were no riskier than what was already available.
Which Devices Need a 510(k)
The FDA classifies medical devices into three risk categories. Class I covers low-risk items like tongue depressors and elastic bandages. Class II includes moderate-risk devices like powered wheelchairs, pregnancy tests, and certain surgical instruments. Class III is reserved for high-risk devices like heart valves and implantable pacemakers.
Most 510(k) submissions involve Class II devices. Many Class I devices and some Class II devices are exempt from the 510(k) requirement entirely, meaning they can go to market without this submission. Class III devices typically require a more rigorous process called Premarket Approval (PMA), which demands clinical trial data proving safety and effectiveness independently, not just equivalence to an existing product.
A 510(k) is also required when a manufacturer significantly changes or modifies an existing device in ways that could affect its safety or effectiveness. Changes to design, materials, chemical composition, energy source, manufacturing process, or intended use can all trigger a new submission.
Clearance vs. Approval
The distinction matters more than it might seem. A device that goes through the 510(k) process receives “clearance,” not “approval.” Approval is the term reserved for the PMA pathway, which requires clinical evidence that the device is safe and effective on its own merits. Clearance means the FDA has reviewed the submission and agreed the device is substantially equivalent to a predicate. It’s a lower bar, and it’s designed to be. The logic is that if a similar device has been safely used for years, a comparable new one doesn’t need to start from zero.
Three Types of 510(k) Submissions
Not all 510(k) submissions follow the same format. The FDA offers three programs, each suited to different situations.
Traditional 510(k): This is the default option, usable for any new device or any change to a previously cleared device. The FDA generally reviews these within 90 days of receipt.
Special 510(k): This streamlined option is available when a manufacturer modifies its own existing device and the methods to evaluate the change are well established. The results need to be reviewable in a summary or risk analysis format. Because the scope is narrower, the FDA typically reviews Special 510(k) submissions within 30 days.
Abbreviated 510(k): Manufacturers can use this pathway when their submission relies on FDA guidance documents, compliance with special controls for that device type, or recognized voluntary consensus standards. Instead of full test reports, the company provides summary reports or declarations of conformity. Review time is generally 90 days, the same as a Traditional submission.
The Review Process and Timeline
Once a 510(k) arrives at the FDA, the first checkpoint is an acceptance review. Within 15 days, the agency notifies the submitter whether the application has been accepted for review or refused. A refusal (called an RTA, for “refuse to accept”) typically means the submission is missing critical information or doesn’t meet formatting requirements.
If accepted, the submission moves into substantive review, where an FDA reviewer conducts a comprehensive evaluation. The reviewer’s first meaningful communication with the manufacturer, called a substantive interaction, should happen within 60 calendar days. From there, the review may continue with additional questions or requests for data. The total process for a Traditional or Abbreviated 510(k) generally wraps up within 90 days, though requests for additional information can extend that timeline.
If the FDA determines a device is not substantially equivalent, the manufacturer has several options: submit a new 510(k) with additional data, request classification through the De Novo process (which creates a new regulatory category for novel low-to-moderate risk devices), file a reclassification petition, or pursue a full PMA application.
What It Costs
All three types of 510(k) submissions carry a user fee. For fiscal year 2026 (October 2025 through September 2026), the standard fee is $26,067. Companies certified as small businesses by the FDA’s Center for Devices and Radiological Health pay a reduced fee of $6,517. One exception: there is no user fee when a 510(k) is submitted on behalf of an FDA-accredited third-party reviewer.
These fees cover only the FDA’s review. The total cost of preparing a 510(k), including testing, regulatory consulting, and documentation, varies widely depending on the device’s complexity and can run from tens of thousands of dollars for simple devices to several hundred thousand for more complex ones.
What 510(k) Clearance Does and Doesn’t Mean
A 510(k) clearance tells you the FDA has reviewed a device and agreed it is substantially equivalent to something already on the market. It does not mean the FDA has independently tested the device, nor does it mean clinical trials were conducted. For most Class II devices, bench testing and engineering analyses are sufficient.
This distinction has drawn criticism over the years, particularly when cleared devices later caused safety problems. Supporters of the system argue it provides a practical, efficient path to market for the thousands of incremental device improvements introduced each year, keeping healthcare technology moving forward without unnecessary delays. Critics point out that a long chain of predicates, each compared to the one before it, can result in a cleared device that bears little resemblance to the original product from decades ago.
For consumers, the key takeaway is straightforward: 510(k) clearance means a device has passed FDA review and can be legally marketed, but the depth of that review depends on how novel the device is and what evidence the manufacturer provided to support equivalence.