Reversibly de-identify clinical text with OpenMed and later restore the original PHI from a saved mapping. Use when the user needs pseudonymization rather than permanent anonymization, wants to mask PHI now and re-link it later under authorization (e.g. recontact, adjudication, GDPR pseudonymization), asks about deidentify keep_mapping, reidentify, or how to store and protect the re-identification mapping. Covers when reversibility is and is not appropriate (pseudonymization vs HIPAA Safe Harbor anonymization). Pairs after extracting-pii-entities and deidentifying-clinical-text.