Why terminology standardisation becomes critical for vigilance systems

The IMDRF N86 document represents a meaningful step toward global alignment of vigilance practice. Inconsistent terminology has historically limited the usability of adverse event data — particularly in cross-border regulatory cooperation, where identical clinical events may be recorded under differing classifications depending on jurisdiction, producing fragmented datasets and reducing signal detection sensitivity.

From a post-market surveillance architecture perspective, this is the gap that has long undermined global vigilance collaboration. Without terminological alignment, regulators operating across EU MDR, FDA, and PMDA frameworks are effectively working from different dictionaries. N86 doesn’t just tidy up language, it creates the precondition for meaningful cross-jurisdictional safety signal comparison.

From an EU MDR Article 87-92 perspective, this directly affects the structural integrity of post-market surveillance systems, which rely on consistent, structured data inputs to identify emerging risks and trigger proportionate manufacturer action.

Key principles for selecting adverse event terminology

N86 introduces a set of governing principles for terminology selection that should be embedded into vigilance system design. These are not aspirational — they are operational criteria against which existing coding practices should be benchmarked:

  • clarity in describing clinical events and outcomes
  • consistency across different reporting entities
  • interoperability with existing coding frameworks
  • adaptability to digital health environments

The interoperability principle is the one manufacturers should focus on first. Many organisations have built vigilance databases around proprietary or legacy coding schemes. N86 forces a structured review of whether those schemes can map to internationally accepted frameworks — and in our experience, the answer is frequently ‘partially at best.’ Early gap analysis is essential.

In practice, terminology selection must balance clinical relevance with regulatory usability -ensuring that reported data can simultaneously support medical interpretation and regulatory assessment, without requiring translation between the two.

Operational impact on manufacturers and vigilance systems

Manufacturers will need to reassess internal vigilance processes against the N86 framework systematically. This is not a minor update — it touches the architecture of post-market surveillance at multiple levels.

  • database structures must support standardised, structured coding fields aligned to N86 principles,
  • SOPs and PMS plans require revision to embed harmonised terminology requirements,
  • vigilance personnel need structured training in consistent data classification under the new framework,
  • quality management systems must reflect updated classification logic across CAPA and trend analysis processes.

Manufacturers who treat N86 as a documentation exercise will miss the point. The real compliance risk lies in vigilance databases that cannot produce structured, comparable output, which directly undermines the organisation’s ability to demonstrate a functioning PMS system under EU MDR audit scrutiny. We recommend a phased implementation review: terminology gap analysis first, system architecture second, SOP revision third.

Toward globally comparable safety data

The broader objective of IMDRF N86 is to enable a more integrated global safety ecosystem. With harmonised terminology:

  • regulators can compare adverse event data across jurisdictions more effectively,
  • manufacturers can begin to streamline multi-market reporting obligations,
  • patients ultimately benefit from improved detection sensitivity for emerging safety signals.

This initiative aligns directly with the accelerating digitalisation of regulatory systems and the increasing reliance on high-quality, interoperable datasets for post-market decision-making — including convergence with the IMDRF PMS framework and the EU EUDAMED infrastructure.

Summary

N86 is the terminology layer that EUDAMED and other centralised regulatory databases have been waiting for. The question for manufacturers is not whether to adopt it, but how quickly they can build it into their systems before regulators begin expecting it as a baseline. Those who act early will have a structural compliance advantage — and a more defensible PMS architecture when it matters most.

Key references

[1] IMDRF/PMS WG/N86 Final — Adverse event terminology principles for medical device Vigilance Reporting (2026)