Pseudonymising GP Medical Notes and Referral Letters – UK GDPR-compliant anonymisation per UK GDPR Art. 9
GP medical notes and referral letters combine special-category health data with rich biographical detail: patient name, address, date of birth, NHS number, presenting complaint, medication history, and family background. anonym.legal pseudonymises these identifiers in free-text and structured fields alike, preserving the clinical assessment, referral rationale, and medication record for secondary review without disclosing individual patient identity.
When this applies
This task applies when GP notes or referral letters are shared with secondary-care clinicians, medicolegal advisers, or clinical governance teams for peer review, complaint investigation, or benchmarking, and those reviewers require the clinical content but not the patient's identity.
How anonym.legal handles it
- Upload the GP notes or referral letter (PDF, DOCX, or plain text) to anonym.legal.
- The engine identifies patient identifiers in both structured fields and free-text body: name, address, date of birth, NHS number, GP registration number, and family member names mentioned in family history sections.
- Each named individual — patient, named family members, and referring clinician — is pseudonymised consistently throughout the document.
- Clinical assessment, medication history, diagnosis codes, and referral rationale are preserved in clear text.
- A reversible mapping table is produced with UK data residency.
- The pseudonymised note is released for the approved review purpose; re-identification uses the mapping key held by the Data Controller.
What you provide
- GP medical notes or referral letter (PDF, DOCX, or text)
- Any accompanying test results or correspondence naming the patient
Limitations & cautions
- Handwritten GP notes require OCR pre-processing before entity detection; OCR accuracy affects coverage.
- Highly specific clinical details — unusual diagnoses in small communities — may remain re-identifying even with names removed; apply additional care for rare-condition cases.
- The tool does not assess clinical accuracy or medicolegal sufficiency of the notes.
FAQ
Are family members mentioned in family history sections pseudonymised?
Yes. Named family members appearing in family history or next-of-kin sections are detected as distinct individuals and each receives a unique pseudonym, preserving the family relationship structure without disclosing individual identities.
Can I pseudonymise a referral letter before sending it to a medicolegal expert?
Yes. This is a primary use case. The pseudonymised referral preserves the clinical narrative the expert requires for opinion while removing identifiers. Ensure you retain the mapping key to re-identify when issuing the final medico-legal report.
Does the tool handle letters written in a mix of structured and narrative formats?
Yes. The engine detects entities in both table-structured fields (patient demographics blocks) and free-text narrative paragraphs within the same document.