NosoNotes Lite
ICD-10 & OPCS-4 National Clinical Coding Standards · OPCS-4 Supplementary Information · Personal Coder Notes
Paste a direct URL to a signed JSON pack file (e.g. a SharePoint or intranet link). The file must be accessible from this device. One file per URL — repeat for multiple packs.
Choose the folder containing your signed JSON guidance pack files. The tool will remember this folder so you only need to do this once. All files load locally — nothing is uploaded anywhere.
Requires Chrome or Edge. You'll be asked to grant folder access — this is a browser security requirement.
Enter a condition, code or keyword — results appear as you type
A browser-based search across the ICD-10 & OPCS-4 National Clinical Coding Standards and the OPCS-4 Supplementary Information, surfacing the standard that governs a topic or code — plus your own personal coder notes.
All processing is client-side — it makes no network calls and nothing leaves the browser. Run it as a local HTML file for fully offline use, or host it as a website for instant access; it behaves the same either way. It is the lightweight web-app member of the NosoNotes family; the browser extension is the full NosoNotes that overlays the NHS Classifications Browser.
Click 📂 Select folder… and choose the folder that holds your signed JSON packs and your own copies of the standards documents.
Results appear as you type — no submit button. Words and codes become coloured chips:
Toggle any band in the legend below the search bar. If more than 200 results match, the top 200 are shown — add a term or code to narrow.
When you search, a gold bar appears above the results: General Classification — Rules, Conventions & General Coding Standards. It is an always-available list of the structural standards (the code-less Rules, Conventions and GCS), so they are one click away whatever you searched. They also still appear in the result bands when your terms match.
When you search a code that appears on the Mandatory Comorbidity or Charlson lists, a gold alert banner appears above the results. It shows which of your codes matched and an “N matched of M” count. Appendix 1 opens at its page in your document; Charlson offers a link to the external SHMI source.
Click the ✎ button (top right) to open the notes panel. Add a note with a title, classification, note text, associated codes and keywords. Your notes surface in the results — ranked above National — whenever they are relevant, with an orange coder note tag. Toggle them in results with the orange Coder Notes pill.
Notes live only in this browser. Export / Import use the NosoNotes format, so a notes file moves freely between NosoNotes Lite and the NosoNotes extension.
The ⚙ button opens Settings: search layers (turn Title, Keywords or Codes matching on/off — references are always searched), coder-note export / import / delete-all, and About with licensing and attribution.
Click a result to open it below the list. For National standards the viewer opens your document at the correct page (Document view). The Formatted button shows a summary instead:
Close the viewer via its header bar, Esc, or a new search.
NosoNotes Lite is client-side: it runs entirely in your browser, makes no network requests, and uploads nothing — whether opened as a local file (fully offline) or hosted as a website. Folder access is a browser permission, not an upload.
The National Clinical Coding Standards (ICD-10 and OPCS-4) and OPCS-4 Supplementary Information are © Crown copyright, published under the Open Government Licence v3.0; the pack files are derivative works of NHS England standards, presented in a restructured, searchable form. This is an independent project — not produced, sponsored or endorsed by NHS England or the Terminology and Classifications Delivery Service; the original documents on the NHS England website remain the authoritative source. No WHO ICD-10 or TRUD OPCS-4 code-description datasets are bundled.
What a signed pack means: a valid signature confirms only that the pack has not been modified since signing and was authorised by the named source. It is not a review or endorsement of the clinical content. Always apply your own professional judgement.