title: A software tool for removing patient identifying information from clinical documents.
abstract: We created a software tool that accurately removes all patient identifying information from various kinds of clinical data documents, including laboratory and narrative reports. We created the Medical De-identification System (MeDS), a software tool that de-identifies clinical documents, and performed 2 evaluations. Our first evaluation used 2,400 Health Level Seven (HL7) messages from 10 different HL7 message producers. After modifying the software based on the results of this first evaluation, we performed a second evaluation using 7,190 pathology report HL7 messages. We compared the results of MeDS de-identification process to a gold standard of human review to find identifying strings. For both evaluations, we calculated the number of successful scrubs, missed identifiers, and over-scrubs committed by MeDS and evaluated the readability and interpretability of the scrubbed messages. We categorized all missed identifiers into 3 groups: (1) complete HIPAA-specified identifiers, (2) HIPAA-specified identifier fragments, (3) non-HIPAA-specified identifiers (such as provider names and addresses). In the results of the first-pass evaluation, MeDS scrubbed 11,273 (99.06%) of the 11,380 HIPAA-specified identifiers and 38,095 (98.26%) of the 38,768 non-HIPAA-specified identifiers. In our second evaluation (status postmodification to the software), MeDS scrubbed 79,993 (99.47%) of the 80,418 HIPAA-specified identifiers and 12,689 (96.93%) of the 13,091 non-HIPAA-specified identifiers. Approximately 95% of scrubbed messages were both readable and interpretable. We conclude that MeDS successfully de-identified a wide range of medical documents from numerous sources and creates scrubbed reports that retain their interpretability, thereby maintaining their usefulness for research.
authors.affiliation: Regenstrief Institute, Indianapolis, IN 46202, USA. jfriedlin@regenstrief.org
authors.forename: F Jeff
authors.initials: FJ
authors.lastname: Friedlin
authors.forename: Clement J
authors.initials: CJ
authors.lastname: McDonald
mesh_terms: D000465:Algorithms; D003219:Confidentiality; D003625:Data Collection / Q000379:methods*; D020408:Health Insurance Portability and Accountability Act; D006801:Humans; D016247:Information Storage and Retrieval; D016347:Medical Records Systems, Computerized; D012984:Software; D014481:United States