This disclosure includes a method of classifying a plurality of subjects associated with medical documents. The method includes receiving, with a computer system, an indication of at least one clinical concept, parsing, with the computer system, the medical documents for corresponding indications of the clinical concept, identifying, with the computer system, subjects in the plurality of subjects as meeting the clinical criterion based on prioritization of sections within the medical documents and locations of the corresponding indications of the clinical concept within the medical documents, and outputting, with the computer system, indications of the subjects in the plurality of subjects identified as meeting the clinical criterion.