How long does a 510(k) take?

The statutory FDA review clock is 90 days, but total time from submission to clearance commonly runs 3 to 9 months once Refuse to Accept review, Additional Information requests, and interactive review are included.

What is the difference between a Traditional, Special, and Abbreviated 510(k)?

Traditional is the default pathway. Special 510(k) is for modifications to a manufacturer's own cleared device where design controls fully evaluate the change. Abbreviated 510(k) relies on FDA guidance documents, special controls, or recognized consensus standards to streamline review.

How much does a 510(k) cost?

The main direct cost is the FDA user fee, which is updated annually and reduced for small businesses. Preparation costs (testing, consulting, writing) are typically far larger than the user fee itself.

Do I need a 510(k) for software changes?

It depends on whether the change could significantly affect safety or effectiveness. FDA's guidance on 510(k) modifications and the separate software modifications guidance provide decision logic; changes that alter indications, add cybersecurity risk, or introduce new algorithms often require a new 510(k).

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RegulatoryRegulated Pathways Global Markets510(k) /five-ten-kay/

510(k) Premarket Notification

FDA submission demonstrating a device is substantially equivalent to a legally marketed predicate.

Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed September 19, 2026

Definition

A 510(k) is a premarket submission made to the U.S. Food and Drug Administration (FDA) to demonstrate that a device to be marketed is at least as safe and effective - that is, substantially equivalent - to a legally marketed device that is not subject to premarket approval (PMA). The comparison covers intended use and technological characteristics, supported by bench, software, biocompatibility, electrical safety and, where needed, clinical data. FDA's review goal is 90 FDA days, and the device may only be marketed once a clearance letter is issued. Most Class II devices and some Class I devices go through this pathway.

What the regulation says

FDA reviewers look for clear side-by-side comparisons to the predicate, complete performance testing, and - when applicable - premarket cybersecurity documentation per Section 524B.

What this means in practice

Most Class II devices in the United States reach the market through the 510(k) pathway. A clearance (often called 'K number') is required before commercial distribution. Choice of predicate, indications for use, and performance testing are central to a successful submission.

Examples

A new infusion pump cleared as substantially equivalent to an existing pump.
A connected patient monitor citing a predicate plus added cybersecurity controls.

Use cases

2 scenarios

Updated patient monitor with a new pulse oximetry module

Regulatory Affairs lead

A Class II patient monitor manufacturer adds a third-party SpO₂ module. They identify their previous-generation monitor as the predicate, document substantial equivalence in technological characteristics, and provide bench performance data per ISO 80601-2-61.

OutcomeFDA clears the device in ~5 months, allowing the new module to ship under the existing brand without a full PMA.

Software-only SaMD diagnostic algorithm

SaMD product manager

A startup files a 510(k) for an ECG analysis SaMD, citing a cleared algorithm as predicate. They submit IEC 62304 software documentation, performance testing on a held-out clinical dataset, and a cybersecurity package addressing FDA's 524B requirements.

OutcomeCleared as a Class II SaMD; the team can begin commercial pilots with hospital systems.

Common pitfalls

•Treating 510(k) clearance as 'FDA approval' - it is a clearance based on equivalence, not an approval.
•Choosing a predicate with materially different indications, technology, or performance.
•Underestimating cybersecurity content now expected for software-containing devices.

Frequently asked questions

No. A 510(k) results in FDA clearance based on substantial equivalence to a predicate device. FDA approval refers to Premarket Approval (PMA), which is used for high-risk Class III devices and requires clinical evidence of safety and effectiveness.

Cross-references

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Precedes

Comes before in a typical workflow or lifecycle.

Post-Market Surveillance(PMS)

Often confused with

Distinct concept frequently mistaken for this one.

Editor's picks

· Hand-selected related concepts

Regulatory

De Novo Classification Request(De Novo)

Pathway to classify novel low- to moderate-risk devices that lack a predicate.

Regulatory

Premarket Approval(PMA)

FDA's most stringent device marketing application, required for high-risk Class III devices.

Regulatory

Predicate Device

A legally marketed device used as the comparator in a 510(k) submission.

Regulatory

Substantial Equivalence(SE)

The legal standard a 510(k) device must meet versus a predicate.

510(k) Fundamentals

· From this learning path

Regulatory

Refuse to Accept(RTA)

FDA administrative decision that a submission is incomplete and won't be substantively reviewed.

Regulatory

Indications for Use(IFU (statement))

Description of the disease or condition the device will diagnose, treat, prevent, cure, or mitigate.

Regulatory

Intended Use

The objective intent of the manufacturer regarding the use of the device.

De Novo & Breakthrough Pathways

· From this learning path

Regulatory

Breakthrough Device Designation(BDD)

FDA program providing expedited review for devices that treat life-threatening or irreversibly debilitating conditions.

Regulatory

Combination Product

Product comprised of two or more regulated components - e.g., drug-device, biologic-device.

Regulatory

Q-Submission (Pre-Submission)(Q-Sub / Pre-Sub)

Voluntary mechanism to obtain FDA feedback before a formal premarket submission.

Commercialization

Pre-Submission Meeting(Q-Sub)

Formal FDA feedback request prior to a marketing or IDE submission.

Founder & Investor Primer

· From this learning path

Commercialization

TAM / SAM / SOM

Market sizing framework: total, serviceable available, and serviceable obtainable.

Adjacent lesson

Investment & Finance

Capitalization Table(Cap Table)

Ledger of all securities issued by a company and who owns them.

Investment & Finance

Convertible Note

Short-term debt that converts into equity at a future financing round.

Investment & Finance

Due Diligence

Investigation of a company before an investment, financing, or acquisition.

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Learning paths (3)

510(k) FundamentalsLesson 1 of 7
De Novo & Breakthrough PathwaysLesson 9 of 11
Founder & Investor PrimerLesson 2 of 16

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510(k) vs PMAvs Premarket Approval

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Tier 1Binding law and standards· 1Tier 2Regulator guidance and consensus· 2

Link health: 3 verified· last checked 2026-06-20

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Category: Regulatory
Acronym: 510(k)
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Updated: 9/19/2026

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Learn in 60 seconds

FDA submission demonstrating a device is substantially equivalent to a legally marketed predicate.

·Most Class II devices in the United States reach the market through the 510(k) pathway.
·A clearance (often called 'K number') is required before commercial distribution.
·Choice of predicate, indications for use, and performance testing are central to a successful submission.

Remember this

Watch out: Treating 510(k) clearance as 'FDA approval' - it is a clearance based on equivalence, not an approval.

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Definition

What this means in practice

Examples

Use cases

Updated patient monitor with a new pulse oximetry module

Software-only SaMD diagnostic algorithm

Frequently asked questions

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Uses

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Related terms

Editor's picks

510(k) Fundamentals

De Novo & Breakthrough Pathways

Founder & Investor Primer

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