What Documentation Is Needed for IEC 62304 Compliance?

Building medical device software comes with a clear set of expectations. IEC 62304 defines the software lifecycle processes you need to follow, and most of those processes come down to one thing: documentation. If your records are clear, complete, and traceable, you are in good shape. If they have gaps, you risk delays during audits and submissions.

This guide breaks down exactly what you need, why it matters, and how to keep your records organized from start to finish.

Essential IEC 62304 Documentation

To demonstrate IEC 62304 compliance, medical device software teams need the following software lifecycle documentation:

• Software Development Plan (SDP): Your roadmap for the entire software lifecycle.
• Software Requirements Specification (SRS): Documented functional, performance, and safety requirements.
• Software Architecture Documentation: A description of how the system is structured into components and interfaces.
• Detailed Design Documentation: Component-level design records (required for Class B and Class C software).
• Software Safety Classification: A justified assignment of Class A, B, or C for the system and its items.
• Traceability Records: Links connecting requirements, architecture, design, and tests.
• Verification and Validation Records: Test plans, test cases, and results that confirm the software meets its requirements.
• Risk Management File: Integration with your ISO 14971 risk activities, including software-related hazards.
• Configuration Management Records: Version control, change history, and identification of software items.
• Problem Resolution Records: Documented handling of anomalies, bugs, and corrective actions.

The depth of each document depends on your safety classification. Class A software needs the least; Class C software needs the most. The sections below explain how to build these records correctly.

The Software Development Plan: Your Foundation

The Software Development Plan, or SDP, sits at the center of IEC 62304 compliance. Think of it as the blueprint that defines how your team will develop, document, and control the software across its full lifecycle.

A strong SDP answers a simple question: how will you build this software in a controlled, repeatable way? When auditors review your file, the SDP shows them your plan before they look at your evidence.

What Your SDP Should Define

Your Software Development Plan should clearly describe:

• The development lifecycle model you will follow.
• The deliverables produced at each stage.
• The standards, methods, and tools your team will use.
• The roles and responsibilities for development and review.
• How you will manage configuration, changes, and problem resolution.

Documenting Requirements, Architecture, and Design

Three core documents flow from your plan, and each one builds on the last.

Software Requirements. Start by documenting what the software must do. Your Software Requirements Specification should capture functional needs, performance targets, interfaces, and safety requirements derived from your risk analysis. Clear requirements set the standard for everything that follows.

Software Architecture. Next, describe how the software is structured. Your architecture documentation should break the system into software items and show how those items interact. This step matters because it defines the components you will later verify.

Detailed Design. For Class B and Class C medical device software, you also document the detailed design at the component level. This shows how each software unit will meet its assigned requirements. Class A software does not require this level of detail, which is one reason your safety classification carries so much weight.

Traceability and Alignment

Traceability is where many teams feel the pressure. IEC 62304 expects you to show a clear thread that connects each requirement to its architecture, its design, and the tests that confirm it works. When that thread breaks, auditors notice.

Why Alignment Gets Difficult

Engineering teams run into predictable challenges when building traceability:

• Requirements shift during development. A late change to one requirement can ripple through architecture, design, and testing. If your records do not keep pace, links go stale.
• Verification gaps appear. Teams sometimes write strong requirements but never document a test that confirms each one. Every requirement needs matching verification evidence.
• Architecture and design drift apart. As developers refine the build, the as-built software can diverge from the documented design. Your records must reflect what you actually built.
• Manual tracking breaks down. Spreadsheets work early on, but they struggle to scale as the software grows in size and complexity.

How to Keep Traceability Clean

A traceability matrix is your best tool here. It maps each requirement to its design element and its verification test in one view. Update it as part of your normal workflow, not as a last-minute task before submission. When you treat traceability as a living record, alignment stays manageable, and your audit story stays clear.

Common Documentation Gaps That Cause Delays

Most IEC 62304 compliance problems trace back to missing or weak documentation rather than poor engineering. During FDA and other regulatory reviews, the same gaps appear again and again.

Frequent Oversights to Watch For

• Incomplete traceability. Requirements that lack a clear link to a test are one of the most common findings.
• Unjustified safety classification. Assigning a class without documented reasoning invites questions. Reviewers want to see the rationale behind your Class A, B, or C decision.
• Weak risk integration. IEC 62304 works hand in hand with ISO 14971. If your software hazards do not connect to your risk management file, that gap stands out.
• Missing SOUP documentation. Software of Unknown Provenance, such as third-party libraries and off-the-shelf components, needs documented identification, requirements, and risk evaluation. Teams often forget this entirely.
• Poor configuration control. Without a clear version history and change records, you cannot prove what you tested or what you released.
• Unresolved anomalies. Open bugs without documented evaluation or resolution suggest a process that is not fully under control.

How to Close the Gaps Early

Run an internal review against the IEC 62304 process requirements well before submission. Check that every requirement has a test, every class has a rationale, and every software item has a clear history. Catching these issues early saves weeks of back-and-forth during an audit.

Managing Complexity and Knowing When to Seek Support

Not every project carries the same documentation burden. A simple Class A utility needs far less than a Class C system that can contribute to serious injury. As your software grows in complexity and risk, so does the rigor required to stay compliant.

How Safety Classification Drives Effort

Your IEC 62304 safety classification sets the bar for your documentation:

• Class A: No injury or damage to health is possible. The lightest documentation set applies.
• Class B: Non-serious injury is possible. You add detailed design and broader verification records.
• Class C: Death or serious injury is possible. You face the most demanding documentation, verification, and traceability expectations.

A single misjudged classification can leave your file short of what reviewers expect, which is why this decision deserves careful, documented thought.

When Expert Support Makes Sense

Some situations call for outside help. Consider partnering with a compliance specialist when:

• You are developing Class C software where the stakes and documentation demands are highest.
• Your system integrates significant SOUP or connects to other devices and platforms.
• Your team is new to medical device software, and the lifecycle process feels unfamiliar.
• You face a tight timeline and cannot afford rework after a failed audit.
• You are moving a product from a non-medical context into regulated medical use.

In these cases, expert guidance helps you build the right records the first time, reduce compliance risk, and keep your launch on schedule.

Build Your IEC 62304 File With Confidence

IEC 62304 compliance rewards teams that plan early and document as they go. Start with a clear Software Development Plan, capture your requirements, architecture, and design, and keep traceability current at every step. Close common gaps before they reach an auditor, and match your documentation effort to your safety classification.

If your team wants a clear path through software lifecycle documentation, MedLaunch can help. Our regulatory specialists review your records, identify gaps, and guide your medical device software toward a smoother submission. Reach out to schedule a consultation and build your IEC 62304 file with a trusted partner at your side.

Tags: IEC 62304, regulatory compliance