{"id":3937,"date":"2025-10-20T20:22:38","date_gmt":"2025-10-20T20:22:38","guid":{"rendered":"https:\/\/www.gilero.com\/?p=3937"},"modified":"2026-08-31T21:25:52","modified_gmt":"2026-08-31T21:25:52","slug":"regulatory-difference-samd-simd","status":"publish","type":"blog","link":"https:\/\/www.sanner-group.com\/insights\/blog\/regulatory-difference-samd-simd\/","title":{"rendered":"Understanding the Regulatory Difference Between SiMD and SaMD"},"content":{"rendered":"\n
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As digital technology continues to reshape healthcare, the line between hardware and software in medical devices has blurred. From embedded firmware to AI-powered diagnostics, software now plays a role in nearly every type of smart or connected medical device<\/a>.<\/p>\n

If you\u2019re designing or developing a software-enabled medical device, understanding the distinction between these two categories can help you determine which standards apply and how to plan your product development and submission strategy accordingly.<\/p>\n

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Defining SaMD and SiMD<\/strong><\/h2>\n

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Software as a Medical Device (SaMD) refers to standalone software that performs a medical function without needing to be part of a hardware medical device.<\/p>\n

Why? The software itself meets the FDA\u2019s definition of a medical device under section 201(h) of the Federal Food, Drug, and Cosmetic Act (FD&C Act).<\/p>\n

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By contrast, Software in a Medical Device (SiMD) refers to software that is embedded within or necessary for the operation of a physical medical device.<\/p>\n

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How do I tell the difference?<\/strong><\/h2>\n

To determine whether your product is SaMD or SiMD, regulators typically ask two fundamental questions drawn from FDA and IMDRF guidance:<\/p>\n

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1. Does the software meet the definition of a medical device?<\/strong><\/h5>\n

In other words, is it intended to diagnose, treat, prevent, or mitigate disease, or to affect the structure or function of the body? If yes, it may fall under device regulation.<\/p>\n

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2. Can the software function independently of a physical device?<\/strong><\/h5>\n

If the answer is yes, it\u2019s likely SaMD. If it\u2019s required for the operation of a specific piece of hardware, it\u2019s SiMD.<\/p>\n

This framework is widely used by regulatory professionals, even though it\u2019s not codified in FDA law. It reflects how agencies evaluate intended use, functionality, and system dependencies.<\/p>\n

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Why the difference matters<\/strong><\/h2>\n

The distinction between SaMD and SiMD has direct implications for:<\/p>\n