Arbiter AI bloghttps://www.arbiterai.tech/blog.htmlField notes on clinical documents, health data standards, and building AI that a compliance officer can audit.en-usFri, 04 Sep 2026 00:00:00 +0000spaCy redacted the word 'daily' — and broke 11 of 12 medication listshttps://www.arbiterai.tech/blog/spacy-redacted-daily.htmlhttps://www.arbiterai.tech/blog/spacy-redacted-daily.htmlFri, 04 Sep 2026 00:00:00 +0000The first eval run scored 23 of 40. Twelve misses were the same question, and eleven of them traced to the de-identifier replacing 'daily' with a date token. The fix, three more Presidio gaps, and the tokens-by-entity count that gave it away.Our de-id recall read 0.967 while ZIP codes survived in 14 of 20 documentshttps://www.arbiterai.tech/blog/deid-recall-flattering-metric.htmlhttps://www.arbiterai.tech/blog/deid-recall-flattering-metric.htmlFri, 04 Sep 2026 00:00:00 +0000The metric checked whether each injected identifier survived whole. An address is four things and only the city was ever tokenized. A strict per-component metric, an address recognizer, and why overlapping spans must merge into their union.The 7B judge scored identical facts 0.0 or 1.0 depending on where the citation sathttps://www.arbiterai.tech/blog/7b-judge-citation-placement.htmlhttps://www.arbiterai.tech/blog/7b-judge-citation-placement.htmlFri, 04 Sep 2026 00:00:00 +0000Five correct answers rejected, all the same question. '9.0% [7].' scored 0.0 and '9.0%. [7]' scored 1.0. Escalation re-ran the same model at 8x the cost, and the judge's calls were half the traffic and never metered.The services were connecting as the Postgres superuser, which silently bypasses RLShttps://www.arbiterai.tech/blog/postgres-superuser-bypasses-rls.htmlhttps://www.arbiterai.tech/blog/postgres-superuser-bypasses-rls.htmlFri, 04 Sep 2026 00:00:00 +0000Five tables carried a tenant-isolation policy and none of it applied, because both services connected as the database owner. The app role, the audit_log grant that defeated append-only, and the cross-tenant probes.Medical record acronyms: what each one means and why it existshttps://www.arbiterai.tech/blog/medical-record-acronyms.htmlhttps://www.arbiterai.tech/blog/medical-record-acronyms.htmlThu, 03 Sep 2026 00:00:00 +0000ICD, MRN, CPT, SOAP, EHR, HL7, HIPAA, PHI, Safe Harbor, BAA, NPI, HITECH, FHIR, ICD-10-CM. A field guide to the fourteen acronyms that shape every healthcare integration, in the order they were invented.