Integrity, or data integrity in regards to health information systems, is the electronic authentication of records. To ensure the integrity of data contained in electronic medical records, all health care organizations that use computer-based systems to manage critical records and functions, should use technologies for electronic authentication that will be capable of identifying individuals who enter or alter information in the electronic record.
National Research Council (1997). For the Record: Protecting Electronic Health Information. Washington, D.C.: National Academy Press.
Health Insurance Probability and Accountability Act (HIPAA) Security Rule
According to National Institute of Standards and Technology Special Publication,  to comply with the Security Rule, covered entities must be aware of the definition provided for integrity:
Integrity is "the property that data or information have not been altered or destroyed in an unauthorized manner."
- Scholl, M., et. al., (2008) An Introductory Resource Guide for Implementing the Health Insurance Portability and Accountability Act (HIPAA) Security Rule, National Institute of Standards and Technology, NIST Special Publication 800-66 Revision 1, October 2008, p.7. http://csrc.nist.gov/publications/nistpubs/800-66-Rev1/SP-800-66-Revision1.pdf (Accessed 18 Nov 2015)