There has been widespread stimulation to adopt health information technology into healthcare delivery in efforts to confront healthcare rising costs, safety, and quality of care. The adoption of electronic medical records (EMRs) does not correlate with functionality utilization into practice. This study examined functional characteristics of EMRs available among physician practices within payer mixes and investigated whether payer mix influenced employed functionality into practice. There was no statistical difference between the number of functionalities employed among higher Medicare and Medicaid practices. Statistical differences were found in employed advanced electronic record functionalities among medium-revenue Medicare and Medicaid practices. Finally, there was a statistical difference between clinical documentation among all practices with EMRs regardless of payer mix. These results suggest that high-volume Medicaid practices tend to adopt more functionality and that medium-volume Medicare practices utilized more advanced functionality types, whereas clinical documentation was employed without payer mix influence.